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WESTERN ELECTRIC 500-series Telephone Types Classic Rotary Telephones (Includes links to info on the 1500, 2500, 3500, Princess and Design Line series.) ©1997-2013 paul-f.com.  All rights reserved. Before copying anything from this site, follow this link.

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Table Key (& Reference Info)	Model Number Format	Case Marking	Component Evolution
500 Set Colors	G Handsets	When Was My Phone Built?	Contributors -- Many Thanks!

RELATED PAGES ON THIS SITE:        500-STYLE SETS COLORS 500 SET DEVELOPEMNT BSPs
WE 300-SETS WE 1500-SETS WE 2500-SETS PRINCESS SETS DESIGN LINE SETS WE AUTOVON SETS

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Updated: 21 April 2013

The 500 series was introduced in 1949 and made by the Bell System until 1986.  Its design was licensed to ITT in 1951 and other manufacturers during the 50s, until it became the standard.  It continues to be made overseas to this day! With the later addition of TouchTone, it evolved into the 1500 (10-button keypad), 2500 (12-button keypad), and 3500 (16-button Autovon military keypad) with similar model numbers.

500-type Rotary	1500-type 10-button dial	2500-type 12-button dial	3500-type 16-button dial

Over the years, numerous variations were made with extra switches, knobs and internal components for special purposes.  Model numbers well above the 5xx range were ultimately used.  Western catalogs and technical documentation only show the models that were in production or service at the publication date.  To understand the full scope of models produced we must compile data from many years of documents.

This page was created as a casual attempt to answer the simple question,

"How many 500-series models did Western Electric make?"

The question was first posed to Antique Telephone Collectors Association (ATCA) and Telephone Collectors International (TCI) members, and other dealers and collectors in early 1997.   Following are the results to date (no claims are made as to accuracy or completeness).

~~ How to use this page ~~

>> Table Organization: Sorted by  model number for the rotary variations.
>> Use:  Search (usually Control-F in most browsers) for the last 3 digits of the model number of your set.
               Or Browse by category, using the links above.

Note: the Control-F search only works for models on this page.  For Touch Tone models, use the links above to go to the appropriate page, then search.

Find the model number of your phone on the bottom plate. In this case, look up 500C or 500D. (This base code was shared by both models.) More on model numbers here. Vermillion ink or other codes stamped on the bottom may indicate that the phone was refurbished. Watch for changed parts.

Manual Sets (sets without dials) had an "apparatus blank" filling the hole in the housing normally occupied by a dial.

For more info, go to 500blanks.html.

Early 500C with soft plastic housing and 95A blank.

Later 500C with hard plastic housing and 95B blank.

(Photos from Russ Cowell)

Looking up the model number for your set should give you a brief description of the major features of the model, and a BSP (Bell System Practices) reference for the rotary set, if known.  When available, photos of some unique features are shown near the model number or linked from the chart entry.  If you don't find your model listed, try looking up the last 3 digits in the tables for other Western Electric models.  Often the major features were consistent among rotary and Touch Tone models.

The BSPs provide technical details and usually a wiring diagram.  BSPs are often found in the Station Service Manuals, Key Systems Service Manuals and Station Specialties Service Manuals published in the 1970s and early 80s.  BSPs or wiring diagrams for some common models are available on several internet sites including the ATCA and TCI club sites.  Several club members have scanned some popular BSPs and make them available on CD.
For more details on BSPs, click here.

You still need to check the internal components as many phones were refurbed and had internal components changed or removed.  For example, many phones marked 501D were converted from party line to single line (500D) by removing the 426A tube as party lines lost favor.  If done in a Bell System refurb facility, the code on the bottom was usually repainted or remarked.  Many independent shops or field mods were not remarked with the accurate model number.

Check out the table key for model numbering background and other reference details.

---

BASIC SINGLE LINE SETS WE500D

MODEL	MAJOR FUNCTIONS	REF	BSP
NOTE: see Table Key for prefix and suffix codes and reference info.
500	Earliest 500 sets were not marked with suffix codes.  500 and date were stamped in ink, usually along the front edge of the baseplate. w/ 425A net & amp; separate 311A equalizer.First production used C2A ringer, then C4A. Note: There were no seperate model numbers for manual and dial versions. Replaced by the 500A and 500B -- often the A/B was added to the existing 500 marking during refurb.	-	C38.595.1 Issue 1: 10/58
500 A 500 B	Early single line w/ 425A net & amp; separate 311A equalizer. Model and date moved to a location near the ringer, near where the word “LOUD” was stamped. See Photo. Note: Bases were marked 500 A/B.  This is a manufacturing code, not the model number.  See the table key for details. Replaced by the 500C and 500D.	2,4,7,8,9	C38.595.1 C38.601 Issue 1: 10/58 502-501-101 502-510-400  502-521-401
500 C 500 D	Later single line w/ 425 B or E net and varistors for equalization. (No separate equalizer needed.) Replaced the 500A, 500B, 500J and 500K sets. This is by far the most popular variation and was made for decades.	2,4,7,8,9	C38.603 502-501-101 502-510-401 502-521-402
500 E 500 F	Single line w/ plunger switch to avoid interference on extensions (or party lines). Lifting the left plunger activates talk and dial circuits. Cradle is marked, “LIFT PLUNGER TO DIAL OR TALK”. Replacing the handset resets the switches.  Replaces the 302AA/AC. See photos.	2,3,4,7,8,9	C32.535 C38.595.1 Issue 1: 10/58 502-501-115 502-510-402 502-580-402
500 H	Single line w/ hooded dial lamp (GE46 bulb, 6-8v ac or dc supply, P17A120 lamp cap assembly [contact me if you have spares of this part!]), 425B network (or later 425E).  The light is only activated when the handset is offhook. Cannot be used as the tip party on message rate, automatic  ticketing, automatic message accounting or zone restriction services.  Replaced by the 500P and U for these services. Announced in 1954. Replaced by the 500P.	2,3,4,7,8,9	C32.535 C32.537 C32.538 C32.539 C38.595.00 C38.595.1 C38.607 C38.621 Issue 1: 10/58 502-501-115  502-510-403  502-580-404
500 J 500 K	Single line w/ 425A net w/o equalizer.  Replaced the 500T.  Many 500T sets were remarked 500 J/K during refurb. Replaced by the 500C and 500D.	2,3,7,8,9	C38.595.1 C38.609 Issue 1: 10/58 502-501-101 502-510-404 502-521-403
500 L 500 M	Single line w/ A-lead control for 1A2. 4-conductor mounting cord and terminal strip installed below dial.  Originally used in applications where the ringer circuit had to be brought out through the mounting cord.	2,7,8,9	C32.537 C38.595.1 C38.610 Issue 1: 10/58 502-501-115 502-510-405 502-580-405
500 P	Single line w/ hooded dial lamp (GE46 bulb, 6-8v ac or dc supply, P17A120 lamp cap assembly [contact me if you have spares of this part!]), 425B network (or later 425E).  The light is only activated when the handset is offhook.  Replaced the 500H to overcome limitations of that set.  Compatible with all services supported by the 500D. (Available in 1955, MD ca. 1960)	2,3,4,7,8,9	C32.535 C32.537 C38.595.00 C38.595.1 C38.611 Issue 1: 10/58 502-501-115  502-510-406 502-510-410 502-580-406
500 R 500 S	Single line for speakerphones, including the 1A, 1A1, 3A and 4A. 10-conductor mounting cord, internal terminal strip, extra dial and switchhook contacts and separate ringer leads for speakerphone control.   See photos  (scroll to bottom of page.)	1,2,7,8,9	C38.595.1 C38.612 Issue 1: 10/58 502-501-115  502-580-408
500 T	Early single line w/ 425A net, no equalizer, but terminal block for handset leads. Use was limited to zones distant from the Central Office, where the attenuating characteristics of the equalizer in the 500 set was not needed.  This was a cost saving measure. Note: There were no seperate model numbers for manual and dial versions. See Photo. Replaced by the 500J and 500K.	1	C38.595.1 Issue 1: 10/58
500 U	Single line w/ hooded dial lamp (GE46 bulb, 6-8v ac or dc supply, P17A120 lamp cap assembly [contact me if you have spares of this part!]).  425B network (or later 425E). Similar to the 500P with the addition of a night light switch (584A key). When switched on, the night light glows dimly when handset is on hook and a full brilliance when off hook.   See Photo. (MD 1963)	2,4,7,9	C32.535 C32.537 C38.595.00 C38.595.1 Issue 1: 10/58 C38.613 502-501-115  502-510-408  502-580-409
500 W 500 Y Photo from Russ Cowell	Single line w/ neon ringing/message waiting lamp for PBX.  Available in 1958.	1,2,4,7,8,9	C38.614 502-501-115  502-580-411
500 AB	Single line for 2-wire or 4-wire circuits (no speakerphone).  Comes wired for 2-wire service butmay be converted at installation to 4-wire service.  Arranged for but not equipped with a KS-8109L2 Buzzer.  Intended for use in 1A1 and 1A2 Key Telephone Systems and 3B Speakerphone Systems, however it is intended for specially engineered lines.  Not for general telephone use. For touchtone model, see 2504 in "Other Variations" below.	6	502-510-411
500 AD	Single line for 4-wire circuits and 3-type speakerphones.  Arranged for 4-wire service and equipped with a switch hook arrangement which provides one spare transfer and two spare make contacts.  The spare make contacts may be used for such purposes as controlling external relays or applying idle line circuit terminations.  Arranged for but not equipped with a KS-8109L2 Buzzer.  Intended for use in 1A1 and 1A2 Key Telephone Systems and 3B Speakerphone Systems. For touchtone model, see 2504 in "Other Variations" below.	2,3,7,8,9	502-501-115 502-512-101 502-512-401 502-580-401
GA-51859 TA236/FT	Single line with Military markings on case: Signal Corps US Army, Telephone Set TA236/FT, Western Electric. (No Bell System markings.)	-	-

BASIC PARTY LINE SETS - 426A (or 425A 4-element) tube for 4-party selective ringing

For photos, see the corresponding sets in the table above.

MODEL	MAJOR FUNCTIONS	REF	BSP
NOTE: see Table Key for prefix and suffix codes and reference info.
501	Earliest 501 A/B sets were not marked with suffix codes. 501 and date were stamped in ink, usually along the front edge of the baseplate. w/ separate equalizer. First production used C3A ringer, then C4A. Replaced by the 501A and 501B -- often the A/B was added to the existing 501 marking during refurb.	-	C38.595.1 Issue 1: 10/58
501 A 501 B	Early party line w/ separate equalizer. Replaced by the 500C and 500D.	1,2,8,9	502-510-400 502-521-404
501 C 501 D	Later party line w/ varistors for equalization. Replaced the 501A, 501B, 501J and 501K sets.	2,8,9	C38.603 502-521-405 502-510-401
501 F	Party line w/ plunger switch to connect talk and dial circuits - to avoid interference with talking party.  Replaces the 306G. See photos.	2,7,8,9	C32.535 502-501-115 502-510-402  502-580-403
500 H with tube	Early party line with dial lamp set.  Created from a 500H by adding the 426A tube.  (For some reason apparently not marked 501H.) Single line w/ hooded dial lamp (GE46 bulb, 6-8v ac or dc supply, P17A120 lamp cap assembly [contact me if you have spares of this part!]), 425B network (or later 425E).  The light is only activated when the handset is offhook. Cannot be used as the tip party on message rate, automatic  ticketing, automatic message accounting or zone restriction services.  Replaced by the 501P for these services.		C38.607 C38.621
501 J 501 K	Party line w/ 425A net w/o equalizer. Replaced the 501T.  Many 501T sets were remarked 501 J/K during refurb. Replaced by the 501 C and 501D.	2,3,8,9	C38.609 502-521-406
501 P	Party line w/ dial lamp. Replaced the 500H with tube.	2,4,7,8,9	C38.611 502-501-115  502-510-406  502-580-407
501 T	Early Party line w/ 425A net, no equalizer, but terminal block for handset leads. Use was limited to zones distant from the Central Office, where the attenuating characteristics of the equalizer in the 501 set was not needed.  This was a cost saving measure. Replaced by the 501J and 501K.	-	C38.595.00 502-510-410
501 U	Party line w/ dial lamp and night light switch	2,3,7,8,9	C38.613 502-501-115  502-510-408  502-580-410

OTHER ROTARY VARIATIONS WE 532

MODEL	MAJOR FUNCTIONS	REF	BSP
NOTE: see Table Key for prefix and suffix codes and reference info.
502 A 502 B	Exclusion Single line w/ extension set exclusion and A-lead control for 1A2 (Pulling up on the exclusion plunger [white] operates a switch which can be used for several functions, including cutting off other extensions on the line for privacy.)	2,4,8,9	C32.540 C38.628 502-515-100 502-515-400 502-531-401
503 B 503 C	Data Single line used with Data-Phone equipment, with exclusion key.	1	C38.620 502-501-120 503-516-100 503-516-401
2504 - - - 3504	2- or 4-wire service The 2504 is equipped with a line switch which provides six transfer contacts and is arranged for two-wire service.  The set is convertible to four-wire service at installation.  35C3B TOUCH-TONE Dial, N1A Ringer, 425G Network, exclusion switch assembly operated by lifting the left plunger, card-operated line switch.  The set is arranged for mounting a KS-8109L1 Buzzer which is not furnished.  Intended solely for specially engineered lines. Not for general telephone use. The ringer adjustment is on the left side along the bottom edge -- just behind the handset cord hole. The 3504 is for the AUTOVON network.  Factory wired for 4-wire service.  66A3A 16-button dial, N1A Ringer, 425G Network,460A diode (polarity guard), 425D diode (surge protector), exclusion switch, G3AR handset.  The set is arranged for mounting a KS-8109L1 Buzzer which is not furnished.  Intended solely for specially engineered lines. Not for general telephone use. For similar 500 series sets, see 500AB and 500AD above.		529-225-102 - - - 502-532-107 502-532-437 Apparatus Catalog, 1970
507 A 507 B	Long loop Single line  w/ 419A diode, 425C net and 151C or 151F fixed gain amp See photos.	3,7	C38.595.1 Issue 1: 10/58 C38.636 502-501-116 502-520-100  502-520-400
509 A 509 B	Long loop Party line w/ 426A gas tube, 419A diode, 425C net and 151C or 151F fixed gain amp See photos.	3,7	C38.595.1 Issue 1: 10/58 C38.636 502-501-116 502-520-100 502-520-400
510 A 510 B	Two line w/ signal key, 4-conductor mounting cord	2,4,8,9	C38.595 C38.628 502-515-100 502-515-400 502-531-402 C38.595
510 E 510 F	Two line w/ signal key, 6-conductor mounting cord    See Photo. Also used on early PBX systems with the switch wired to provide “ground start” during power failures.	2,8,9	C38.595 C38.628 502-515-100 502-515-400 502-531-402 C38.595
511 A 511 B	Two line w/ extension set exclusion and signal key	2,4,8,9	C38.595 C38.628 502-515-100 502-515-400 502-531-403 C38.595
511 C 511 D	Two line w/ extension set exclusion, signal key and speakerphone	2,8,9	C38.595 C38.628 502-515-100 502-515-400 502-531-404
511 F	Two line w/ extension set exclusion, speakerphone and A-lead control for 1A2, spade tip cord	2,8,9	500-124-180 502-531-405
511 H	Two line w/ extension set exclusion, speakerphone and A-lead control for 1A2, D50 connector	2,8,9	502-515-100 502-531-405
511 X30A	Voice Coupling using 30A Voice Coupler. Provides 2-wire connection of customer-provided voice transmitting and/or receiving equipment to Bell lines, DC isolation and limits excessive line signal. Has a standard ¼” phone plug on the right side. Connection is made by operating the exclusion key.	-	502-501-901SW
512	With key for Secretarial exclusion  See Photo.	-	-
513 B	Early Data-Phone w/test key and lamp.  Mounting cord plugs into the J1D401F data set.  Exclusion key (left plunger) transfers set between voice and data modes.  Lamp illuminates when test mode is operating.	4	C38.595 C38.627 502-501-120 503-516-100 503-516-402
514 B	Headset Jack Single line with headset jack in back and headset mode/recall switch above right of dial.  Ringer loudness control on left side behind handset cord cutout. Message waiting lamp optional with D-17998 kit of parts.  See Photos. Available starting in 1965.	2,7,8,9	502-501-115 502-520-101 502-520-401 502-580-412
515 B	Two line w/ signal key and hold button, 6-conductor mounting cord	1,2,4,8	502-515-105 502-515-405 502-531-406
516 B	Single line w/ "make-busy" turnkey and indicator lamp (for PBX, 802A hotel)	2	502-580-463
520 A 520 B	"Explosion proof" Single line w/ industrial round wall enclosure See photos	2,5	C38.595 502-415-100 502-415-203
522	“Elevator” phone.   Mounted on a panel with the handset recessed. (Northern Electric.  Haven't found a reference for a Western Electric set yet.)	-	-
525 A 525 B	Weatherproof housing for outdoor use, complete.   Based on 325 set design. Uses optional KS-8028 lock with skeleton key.  See photos Note:  The same housing is also used for the 695-type subset, which has just a handset, switchhook and terminal strip inside.  See 502-201-102.	2,9	C38.821 502-560-100 502-560-201 502-560-400 502-580-437
526 A 526 B	Weatherproof housing for outdoor use, sold as components. (later design than 525)	2,4,8,9	502-580-438
529 A 529 B	No network, 12 conductor cord for 101- and 102-key equipment. Available in black only. Replaced 329C set. D12H-03 cord, 9P-03 dial, H1A ringer, G3AR-03 handset. Optional: KS-8109L2 buzzer, 152A capacitor, 61A filter.	-	502-560-109
532 A 532 B	Impaired Hearing Single line w/ receiver amplification and volume control.  151A amplifier, 419A varistor, and P13A693 potentiometer. See Photo.	3,7	C38.595.1 Issue 1: 10/58 C38.629 502-501-116 502-520-100 502-520-402
533 A 533 B	Impaired Hearing Party line w/ receiver amplification and volume control. 151B amplifier, 419A varistor, and P13A693 potentiometer.	3,7	C38.595.1 Issue 1: 10/58 C38.629 502-501-116 502-520-100 502-520-402
535 A 535 B	Noisy Locations Single line w/ receiver amplification and push-to-listen button (G2 or G5 handset). It provides limited receiver amplification and limited reduction of transmitter and sidetone levels with the handset push-to-listen button normal.  151B amplifier, 419A varistor, P13A693 potentiometer, P-10C610 terminal block.	7	C38.595.1 C38.633 Issue 1: 10/58 502-501-116 502-520-100 502-520-404
536 A 536 B	Single line w/ speech amplification. Useful for whispered confidential conversations. 151B amplifier, 419A varistor, P13A693 potentiometer, P-10C652 terminal block and 266A inductor.	3,7	C38.595.1 C38.635 Issue 1: 10/58 502-501-116 502-520-100 502-520-406
537A	Rotary dial telephone e/w G5U handset, flush mount loudspeaker, battery test button, RCVR VOL pushbutton, emergency button.  12V dry cell battery for 3 months of average use. Mechanically rugged, portable, corrosion resistant, "sealed against 100-percent humidity and forceblown rock dust." (!!)  Operates at -18 to 60 degrees C (0 - 140F).  Meets requirements for "Intrinsic Safety" in Mineral Resources, Title 30, Part 23 (Telephone and Signaling Devices), UL Standard 913 and National Fire Protection Association 493. Approx. 18.58 in x 14.04 x 9.56.  28 Pounds. Initial Use: No. 1A Industrial Communication System Comcode: 103 222 592		WE Card Index 5/29/81 Found by Rick Walsh
54x	See Key Sets	-	-
55x are all wall sets 552	Single line wall w/ exclusion plunger on top.	7	500-124-180
554 A 554 B	Single line wall. Announced in 1955 in black and ivory.         554 Modified for "Lift Plunger to Talk or Dial."	2,4,7,8,9	C38.595.1  Issue 1: 10/58 C38.637  Issue 2: 12/57 502-501-101 502-521-410 502-510-410
554 F	Single line wall equipped with 9 foot handset cord.	2,4,7,8,9	502-501-101  502-521-410 502-510-410
555 B	Two line wall w/ signal key and hold button	2,8,9	502-515-415 502-531-407
556 A 556 B	Party line wall	2,7,8,9	C38.595.1 Issue 1: 10/58 C38.637 502-501-101  502-521-411 502-510-410
557 A 557 B	Long loop Single line wall w/ 419A diode, 425C net and 151C or 151F fixed gain amp	7	502-501-116 502-520-100 502-520-400
558 A 558 B	Two line wall w/ signal key. Above: Modified 558 with amplifier added.  Functions like the 532 desk set above.	2,4,8	C38.638 502-515-100 502-515-401 502-531-408 C38.595
558 C 558 D	Two line wall w/ signal key, exclusion and control leads	2,7,8,9	502-501-116  502-515-100 502-531-409 C38.595
558 F	Two line wall w/ signal key, control leads and A-lead control for 1A2. See photos	2,9	502-515-100 502-531-410
559 A 559 B	Long loop Party line wall w/ 419A diode, 425C net and 151C or 151F fixed gain amp	7	502-520-100 502-520-400
56x	See Key_Sets	-	-
570 Photos from John Corley	Large roadside "Emergency" or "Fire" set, manual only, Usually painted bright red or yellow. Cover removed to show internal components.	8,9	C38.813 502-550-100 502-580-455
575	See Key_Sets	-	-
581 A	Internals for customer-supplied housing and handset.    (Also used in design-line phones.) Replaced F-55659 and F-56660.  See photos.	2,8,9	503-100-120 Issue 1: 10/70
591 A 591 B	Desk set supplied to operating company with no Bell System markings or ringer -- for installation of a frequency selective ringer for party line use. See photos	-	No BSP - see 500D Connection Diagram in box
592	Single line set with internal speakerphone microphone and controls -- used with 1A and 1A1 Speakerphone systems.  See details and photos Announced in 1954.	4	512-610-100 512-610-101 512-610-200 512-610-400
593	Wall set sold to independents without a ringer, marked "Western Electric" See photos	10	No BSP - see 554 Connection Diagram in box
596 E	"This is a desk type manual telephone set intended for use in the Command Post Alerting Network (COPAN)."  Available only in yellow (-56) and light gray (-61)".  Manual set, 2 or 4 wire, manual 4-step ringer volume control, neon lamp equipped, ringer supplement, push to talk handset.  Consists of: PTT handset (G5RR), hookswitch, C4A ringer, hook switch, dial blank, neon lamp and domed lens (in position of message waiting lamp on 500W/Y), 10 conductor mounting cord, no network.  The round number card in the dial blank says: "JCS ALERT NET/Emergency Use Only" (Joint Chiefs of Staff)	-	529-205-148
597 AR	"Used in the (SAC) Strategic Air Command secondary and primary alerting systems."   Desk manual set. Available in red (-53) only.  The set has no ringer or network.  Just a handset (G3BR), hookswitch, terminal strip, dial blank, and a 6-conductor line cord.  Used with 4-wire circuits.	-	502-536-100 529-205-110
66x	See Automatic Dialers	-	-
75x	See Panel Phones	-	-

ROTARY KEY SETS WE 544

MODEL	MAJOR FUNCTIONS	REF	BSP
NOTE: see Table Key for prefix and suffix codes and reference info.
540	4-button,  non-lighted buttons  B: H P P P, 14-conductor line cord  (Note: Button codes for all key systems descriptions:      H = hold, non-locking      P = pickup, locking      S = signalling, non-locking      PS = pickup, locking, convertible to signalling, non-locking      C = cutoff, turn button) 500-series keysets announced in 1955.	-	502-525-200 502-525-300 502-525-400 502-541-401 C32.558 C32.561 C38.595
541	4-button, non-lighted buttons and exclusion,  14-conductor line cord	7	500-124-180
543	4-button, single line, specific to a 761A PBX Designed for the small hotel/motel market, used in the guest rooms.  Control buttons and "A-leads" (control leads) tell the switching equipment what kind of line to connect to the set (switching done within the PBX). 4 buttons marked "Message waiting" (the front desk could illuminate it to alert you to a message), "Desk" (connected you to the front desk), "Local" (connected you to a CO trunk for a local call), and "Long distance" (gave you a direct path to a toll operator).  Only 3 of the 4 buttons depressed.   These button features relieved the attendant of having to route much of the guest traffic. Outwardly, these sets look like a 544 or 545 set but have fewer line cord conductors (12). 543DB – 641A line key, C4B ringer 543DBC – 588B line key, C4A ringer – field/distributor converted from 544BB or 545BB. See photos	-	502-580-431
544	4-button, lighted buttons.  See photos A: P P P PS, 25-conductor line cord  B: H P P PS, 19-conductor line cord	-	C32.558 C32.561 502-525-101 502-541-402
545 B 545 G	4-button, lighted buttons and exclusion. B: H P P PS, 24-conductor line cord (GBR)	7	500-124-180 502-525-101 502-541-403
561	6-button, non-lighted buttons and exclusion.  25-pair line cord.	-	C38.595 502-525-200 502-525-300 502-525-400
563	6-button, headset connection.  25-pair line cord.	7	500-124-180 502-525-102 502-525-403  502-541-404
564	6-button, lighted buttons  B: H P P P P P, 28-conductor line cord  C: H P P P P S, 25-conductor line cord  D: H P P P S S, 25-conductor line cord HD: 30 or 34 conductor line cord.   No lamp for HOLD key. HK/HL:  30 conductor line cord.  No lamp for HOLD key.	-	C32.558 C32.561 502-525-102 502-525-404 502-525-410 502-541-406 502-541-407
565	6-button, lighted buttons and exclusion  A: P P P PS PS PS, 34-conductor line cord  B: H P P PS PS PS, 34-conductor line cord  E: H P P P PS C, 31-conductor line cord Later sets with speakerphone and 25-pair line cord:  GA, GB, GK (6-line pickup)  HA, HB, HD, HK (5-line+hold)  LA, LB, LD, LK (hold,4-line pickup,cutoff)      (Lamp for HOLD key except on –K sets.)	7	C32.558 C32.561 500-124-180 502-525-103 502-525-405 502-525-406 502-525-408 502-525-409 502-525-411 502-541-410 502-541-414 502-541-415 502-541-416
566	6-button, used with 755A PBX May be adapted to 750A PBX.    Only one set of Tip and Ring go to the set, as line switching was done in the PBX. FB, MB (wired for 1A speakerphone and busy lamp), MD	-	C38.851 502-525-103 502-529-400 502-541-419
567 PB	6-button Data Aux Set Used to control the 103A and other early modems  (buttons: data, talk, test1, test2, local, auto)	7	500-124-180  502-501-122 502-534-100 502-541-429
568 H	6-button w/ exclusion (HB,HF,HR,HT)  2 or 4-wire operation (P25E963 relay assembly).  HB has round buttons on the key strip and metal fingerwheel.  HF replaced HB and has H1A ringer.  HR replaced the HF and has N1A ringer with side-mounted volume control and case markings for LOUD and OFF, and a clear fingerwheel.  Room for optional AC or DC operated buzzer.  Available in black, red and white.	7	C38.595 C38.642 500-124-180 502-532-100 502-532-400 502-532-407 502-541-420 502-541-420 502-541-420 502-541-423 CD/SD-69425
568 HT	Early touchtone keyset (before 1500 numbering), relay for 2 or 4-wire operation.  Has 22-type dial with P (Priority) and SG (Special Grade) buttons,  and round line and hold buttons on key strip.  Has square buttons on key pad. Available in black only.  (See photos.) 1568HT replaced it. 568HB,HF,HR is the rotaty version.  2568HAA is a later 12-button touchtone model.	7	C38.595.06 500-124-180 500-542-406 502-503-410 502-532-100 502-532-400 502-546-406 CD/SD-69423 22-type Dial: C18.006.00 501-164-102
569 NB	Data Service 6 Buttons: data hold, talk, test, 1st pickup, 2nd pickup, auto answer or 3rd pickup	7	C38.643 500-124-180  502-501-122 502-533-100 502-541-430
575 AM	6-button keyset for Comkey system intercom-only stations Comkey 718, 734, 1434 and 2152.  Red non-functioning key may be used for message waiting, 3 intercom line keys and 2 unused keys.	-	503-603-120 518-450-110 Issue 1:  1976
(CLICK IMAGE FOR LARGER VIEW)	This section contains Call Director sets, which were introduced in 1958, and "Call Director-type" telephone sets and consoles made from similar components and contained in related BSPs. Similar touch tone sets can be found on the 1500-, 2500- and 3500-series pages: 1500-series CallDirector 2500-series CallDirector 3500-series (AUTOVON) CallDirector
600 (CLICK IMAGE FOR LARGER VIEW) 601 (CLICK IMAGE FOR LARGER VIEW)	Call Directors, General Purpose    18-button    30-button D1A Ringer (adjustment on front left of set), 6L dial. For 1A1 and 6A Key Telephone Systems, NOT 1A. Call Directors announced in 1958. Replaced by the 630-series.	-	C38.650 Issue 1: 1958 C38.653 502-630-101
608	Call Director 2 or 4-wire    30-button 608C with headset jack, Flash and Release keys. For 1A1 or 1A2 Key Telephone Systems.	-	C38.655 500-124-180 502-608-100 502-608-400
609 (CLICK IMAGE FOR LARGER VIEW)	Call Director, used at supervisor desk with a dial TWX or WADS No. 6A teletypewriter switchboard.  Moss green (-51). 589G keys (4) plus 617A Key.	-	502-609-101 502-609-401
616 (CLICK IMAGE FOR LARGER VIEW)	Call Director, 18-button, used with Switched Circuit Automatic Network (SCAN). 2- or 4-wire circuits, 1A1 or 1A2.  Flash and Release keys. Moss green (-51). 22B TouchTone dial with P and SG keys (like the 568HT above.). Replaced by (renumbered to) the 1616 shown here.	-	C38.658 502-616-120 502-616-401
617	Call Director, 30-button, used in FAA installations. 2- or 4-wire circuits. Light Gray (-61).	-	C38.658 502-616-101 502-616-402
618	Call Director, 2 or 4-wire service.    18-button Headset jack, Flash and Release keys. For 1A1 or 1A2 Key Telephone Systems.	-	C38.655 500-124-180 502-608-100 502-608-400
619	Used with 5A Announcement Systems	-	WE Tel.Prod HB, 1975
621	Used by 701B PBX attendant.	-	C38.656 502-620-400
622	Used in No. 5 crossbar systems arranged for customer group service.	-	C38.656 502-620-401
623	Used with Master Control Center of Electronic Switching System Offices. Light Gray (-61).  18-button.	-	WE Tel.Prod HB, 1975
624	Used with the recorded announcement frame of the No. 1 Electronic Switching System (ESS).	-	WE Tel.Prod HB, 1975
625 (CLICK IMAGE FOR LARGER VIEW)	Call Director, used with the 110A key telephone system. No dial. Moss green (-51). Turnkeys for battery and buzzer.  G5 push-to-talk handset.	-	500-124-180 502-625-100
630  631 630-type with Speakerphone (Photo from John Decker)	General purpose Call Director    18-button    30-button Replaced 600A and 601A.  Uses "even count" color codes. For 1A, 1A1 and 6A Key Telephone Systems.	-	C38.651 502-600-100 502-600-101 502-600-301 502-610-406 502-630-100 502-630-101 502-630-200 502-630-401 502-630-402
632	Call Director for "limited use"   18-button Replaced 600B. For 1A1, 1A2 and 6A Key Telephone Systems, NOT 1A.	-	502-600-100 502-600-101 502-600-301 502-630-101 502-630-402
634 (CLICK IMAGE FOR LARGER VIEW) 635 (CLICK IMAGE FOR LARGER VIEW)	Call Directors used with station line concentrators    18-button 30-button Replaced 600C and 601C.  Uses "even count" color codes. For 1A, 1A1 and 6A Key Telephone Systems.	-	C38.650 C38.651 502-600-100 502-600-101 502-600-301 502-610-409 502-634-101 502-634-401
636  637 Looks like this 683 set Photo from Dave Friedman	General purpose Call Directors with headset jack    18-button 30-button Flash and Release keys above dial. 151D amplifier. Uses "even count" color codes. For 1A, 1A1, 1A2 and 6A Key Telephone Systems.	-	C38.650 C38.651 502-600-100 502-600-101 502-600-301 502-610-418 502-636-101 502-636-111 502-636-401
638 (CLICK IMAGE FOR LARGER VIEW) 639 (CLICK IMAGE FOR LARGER VIEW)	Call Directors with headset jack used with station line concentrators    18-button 30-button Flash and Release keys above dial. 151D amplifier. Uses "even count" color codes. For 1A1, 1A2 and 6A Key Telephone Systems.	-	C38.651 500-124-180 502-600-100 502-600-301 502-636-101 502-636-111 502-636-402
643	Call Director, used in the 11A Alerting System.	-	WE Tel.Prod HB, 1975
66x	See Automatic Dialers	-	-
680 681	Call Director, "Not for general telephone use. Shall not be used unless specified by service order."    18-button    30-button	-	WE Tel.Prod HB, 1975
682 683 Photo from Dave Friedman	Call Director, for 2- or 4-wire operation.    18-button    30-button	-	WE Tel.Prod HB, 1975
691A	Subset used with data set 101A in Models 14, 15 and 19 teletypewriters. 6-button keyset. Has no hookswitch or transmitter element – uses 732A receiver (which looks like a G3 handset with no holes in the transmitter cap!). Keys marked ANS/CLEAR/ORIG/ /TEST/LOCAL. First 4 are momentary, last two lock. 425F network, 7L dial with numbers-only plate, C4A ringer and 589S Key. Bottom plate marked, “SUB SET 691A”.  See photos.	-	502-200-101 502-200-300
754	See Panel Phones	-	-
830	10-button desk set	-	503-701-101
831	20-button desk set	-	503-702-101
832	10, 11 or 13- button keysets used in Comkey 718 and 2152 systems (see BSPs) 11-button sets have HOLD, 7 line pickup, 2 intercom lines and RECALL. 13-button sets add Privacy Release and Ring Transfer Variations for both desk and wall mounting.	-	503-701-110 518-450-110
833	20-button keysets used in Comkey 718 and 2152 systems (see BSPs) HOLD, 14 line pickup, 3 intercom lines, RECALL and Privacy Release -OR- Ring Transfer. Variations for both desk and wall mounting.	-	503-702-110 518-450-110
835 836	10-button keysets, Comkey 416 Primary station with power supply and logic.  (see BSPs) 10 key Direct Station Select field.  (Replaced by 981 sets)	-	518-450-105 518-450-106
837	10-button keysets, Comkey 416 Satellite station without power supply and logic.  (see BSPs) 10 key Direct Station Select field.  (Replaced by 981 sets)	-	518-450-105 518-450-106
851	6-button wall set	-	503-601-101
852	10-button wall set	-	503-702-102
981	10-button keysets, Comkey 416, 4A Communication System Primary (981A01) and Satellite stations (981A02 desk, 981A03 wall).  (see BSPs) 10 key Direct Station Select field.	-	518-450-105 518-450-106
983	10-button keysets, Comkey 416, 4A Communication System Satellite stations with BIS (built-in speakerphone, 983A01), or HFAI (Hands-free answer intercom, 983A02).  (see BSPs) 10 key Direct Station Select field.	-	518-450-105 518-450-106

ROTARY AUTOMATIC DIALERS WE 661

RELATED PAGES ON THIS SITE:  
WE Card Dialers WE 1660-SERIES WE 2660-SERIES WE AUTOVON Dialer

MODEL	MAJOR FUNCTIONS	REF	BSP
NOTE: see Table Key for prefix and suffix codes and reference info.
660	Automatic Dialer - Uses plastic cards to store phone numbers to be automatically dialed. A lead control.   See Card Photos. Card dialers announced in 1961.	-	502-617-400 502-660-100 502-660-101 502-660-120 502-660-400
661	Keyset, 6-button Automatic Dialer - 40A dial, G1A ringer.  40A dial is polarity sensitive and operates from line current.	-	C38.665 (Issue 2: 4/61) 502-661-101
662	Keyset, 6-button Automatic Dialer - 41A dial, optional exclusion feature, wired for speakerphone use.  "Speakerphone and exclusion cannot be provided at the same time because of insufficient mounting cord conductors" (C38.666.00, I1) 41A dial is not polarity sensitive and requires a low voltage power supply that delivers 12.5-19 vac to the dial.	-	C38.666.00   (Issue 1: 1/63) 502-617-402 502-660-102 502-660-402 502-662-100
663	Automatic Dialer - wired for headset use, has 242-type amp, jack in back and turnswitch for ON/OFF control.	-	502-617-403 502-660-101 502-660-120 502-660-403
664	Keyset, 6-button Automatic Dialer -  wired for headset use, has 242-type amp, jack in back and turnswitch for ON/OFF control.	-	500-124-180 502-660-102 502-660-404
665	Automatic Dialer for 2 or 4-wire service	-	500-124-180

ROTARY PANEL PHONES WE 750B

MODEL	MAJOR FUNCTIONS	REF	BSP
NOTE: see Table Key for prefix and suffix codes and reference info.
750 A 750 B	Single line panel phone.  Mounted in a metal box recessed into the wall. Used on CO or PBX lines. Grill on front for ringer and knob for ringer adjustment.	7	C38.680 C38.851 502-705-100  502-730-401 502-750-100 502-750-300 502-750-400
751A 751 B	2-line panel phone with exclusion.  Used on CO or PBX lines.	7	502-733-401 502-750-100 502-750-401
751C 751 D	2-line panel phone with exclusion.  Used on CO, PBX, 1A1 or 1A2 KTS lines.	7	502-705-101 502-750-100 502-750-401
752	Panel phone with 3-type speakerphone.	-	502-705-102 502-736-401 502-750-102 502-750-402
753 A 753 B	2-line panel phone with hold	8	502-705-103 502-739-401 502-750-103 502-750-403
754	6-button keyset panel phone	-	502-705-102 502-736-402 502-750-104 502-750-404
755 Photo from Jeremy Walters	Armored, with armored cord (like a pay phone).  Used in lobbies to communicate with tenants.	-	502-750-105

KEY:

MODEL Number Format = 5nnv,      where 5nn=model number, and v indicates model variations.
                                             e.g. 500D 

Many bases are marked on the bottom 5nn x/y (e.g. 500 C/D).  This was a manufacturing convenience used where the same base component was used to build several different variations and is not the model number.  Usually x=manual version (no dial) and y=with dial.  Model number 500C has an apparatus blank instead of a dial.  Model number 500D has a dial. There are exceptions.  The 500 P/U base was used to make the 500P or 500U sets, both of which have dials.  Some bases are marked 500 P, some 500 U and some 500 P/U.

• Many TouchTone models have similar numbers, with a prefix of 1, 2 or 3,  e.g. 15nn x/y. 
         (See the appropriate site page for touch tone models.  Links at the top of this page.)

• Prefix codes: 
         1: TouchTone models, 10-button keypad  (digits 0-9),  e.g. 1500D, announced 1964, MD 2/68;
         2: TouchTone models, 12-button keypad  (digits 0-9, * and #), e.g. 2500D, phased in during 1968;

  3: Autovon models, 16-button keypad  (adds FO, F, I and P keys), e.g. 3504B, announced 1969;

CS: later models (1980s) which were customer-owned (including internal components),  e.g. CS2500.

• Suffix codes (Note: multiple suffix codes may be used on one set):   

M	Modular handset and line connectors,    e.g. 500DM - 500D, Modular. 1M or 2M suffix indicated bases that were inventoried as components, separately from the color parts such as the housing and handset.  This was done to economize on the size and weight of sets carried in the installers' trucks.  e.g. 500D2M - Modular 500 base Planned daily installations were stocked in the truck as fully assembled sets (e.g. 500DM).  The installer could assemble a set of the proper color for an extra extension added to the order while on site using a 500D2M plus color kit plus cords. More info in BSP 503-100-100.
G	Polarity Guard installed  (TouchTone models),   e.g. 2750AMG - 2750A panel, Modular, with Polarity Guard.
P	Wall set with modular wall plug,   e.g. 554BMP - 554B wall, Modular, with Wall Plug on back of set.
R	Retractile cord (coiled handset cord),    e.g. 500UR - 500U with Retractile cord. (R is not usually marked on sets.  Found in catalogs and on boxes.)	(Photo of box end)
W	Without Bell System markings   (for units sold outside the Bell System),   e.g. 500ABMW - 500AB, Modular, Without Markings. Handset handle and housing moldings eliminated any reference to the Bell System.	(Handset and housing photos from Jonathan Sowers)
-nn	Color Code,    e.g. 500D-54 (brown).  For color list, see Colors.   e.g. 7D-3 (black) dial. Color code is rarely marked on sets.  For a short time in the 1950s, when color was new, dials and occasionally bases had a color code.  More often found in catalogs and on the boxes. (See photo of 500UR-59 above.)
*	Set wired for 1A1 or 1A2,   (typically found on 500L/M or keysets),   e.g. 500M*	(Photo from David Haber)

? (in table entries) = Model identified, but feature description and reference still needed.   Please help!

• Note: WE made many models based on the 500 design with model numbers outside the range 500-599.

SAMPLE MODEL AND DATE MARKINGS:
The markings are usually found in the back right corner of the bottom plate -- either below or to the left of the ringer adjustment wheel.

Set is a 500C (no dial) (Vermillion code indicates set was refurbished.)	Set is a 500D (dial) Color 54 = dark brown	Set is a 500AB M = modular W = without Bell System Markings	Set is a 554B CS = Customer Owned M = modular P = modular plug installed

Note: date codes on the right two phones are in the form YYDDD, where YY is the last 2 digits of the year and DDD is the numeric day of the year (001-365).  Their bases are cad plated, rather than the original black.

Date codes changed format in about 1978 for 500-type sets and in about 1977 for Princess sets.

• COMPONENT EVOLUTION: Model numbers relate to "function" while components in each model changed from time to time, and were often phased gradually into production.  For example, in the 500D:

• Plastic Shell:  Soft plastic (1949) > Hard ABS plastic (Gradually phased in between 1959 and 1964);  
  
• Western Electric bakelite and soft plastic receiver caps generally have 6 holes in a circle, and transmitter caps have three concentric circles of 6, 12 and 18 holes, for a total of 36.  Hard plastic caps each have the same pattern with the addition of one hole in the center of the pattern.  Note that caps were often changed in refurb, so are not a reliable indicator of handset plastic material.  For example, soft plastic caps are often found on bakelite handles marked G1.
• Handset: black sets: G1 bakelite (1949) > G3 plastic (phased in 1962-65) > G15 modular (~1972); 
  
• Handset: colored sets: G3 plastic (1953) > G15 modular (~1972)
  
• Handset cord strain relief:  2 piece design (1949) > integrated with transmitter cup (~1952);
• Cords:  Hardwired (1949) > Modular connectors (~1972);
• Dial:  black sets: 7A (1949) > 7D > 9-series (~1963);
• Dial:  colored sets*: 7C (1953) > 7D > 9-series (~1963);
  
• Fingerwheel:   Black metal (1949) > Clear Plastic, "open center"* > Plastic, solid center (~1962);
• Network:  425A (1949) > 425B (1952) > 425C > 425E > 4228 > 4293 (~1983); 
• Ringer:  C2A or C3A (party line) (1949) > C4A (~1954);
• Baseplate:  Painted black (1949) > Cad plated (~1967)  [see photos above];
• Feet:  Leather-covered (1949) > Triangular Neoprene (1958) > Round ribbed (1963) > Round flat (~1966);
• Hookswitch plungers:  Black (1949) > Clear * (all colored sets and with hard plastic for black sets);
• Shell date code (inside):  Printed in ink along front edge (1949) > pressed in circle near cradle (~1960);
• Handsets and bottom plates marked "Bell System Property, Not for Sale" (1968-1983).

* Changes with Colored Sets starting in 1953: 7C dial, clear hookswitch plungers, clear plastic fingerwheel.  Look for color code on the back of the 7C dials,  e.g. 7C-59.  Clear plastic fingerwheels were also used on black 500H, P and U sets.

(Many individual components have date codes.  It is not uncommon to find refurbished phones with internal components of mixed dates, as the Bell System was a master of recycling.  I have several sets with 2 leather feet and 2 plastic feet thanks to the refurb shop.  The real treasure is to find an early set where all the dates match!)

• WE also made specials for large customers (e.g. Howard Johnson).

• Exclusion keys were wired for many purposes, including ringer cut-off, extension station cutoff, etc.

References include:
1. Station Service Manual (325-048), 8/80
2. Southern Bell Station Service Manual, V2, 2/74
3. New England Telephone Service Manual, 1970
4. 100 Years of Bell Telephones, Mountjoy, 1995
5. Telephone Collecting: Seven Decades of Design, Dooner, 1993
7. New England Telephone Station Installation Handbook V2, 9/70
8. Bell System Station Service Manual, 8/77
9. Bell System Station Service Manual, 9/78
10. Western Electric Catalog #10

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WHEN WAS MY 500-TYPE SET BUILT?

It's time for some detective work.  Fortunately, Western Electric left a lot of clues for us to follow.  Most components of the 500-series sets had both model numbers and dates.  This was important for them, as the Bell System owned the phones at the time, and refurbished the sets to extend their useful lifetime.  Most of the sets we find today were in service for many years and were probably refurbished at least once.  Original components were replaced with the currently manufactured parts.  Therefore, internal dates of the components do not always match.

The dates that are the most important in establishing age are the date on the bottom plate and the date on the network.  These two components were usually joined in the assembly process using rivets, so were difficult to change in refurb.  If the dates match, that was most probably the assembly date of the phone.  Other components  used in the assembly would originally have had the same month code or perhaps a date a month or two earlier.  

Look at the model number and date information carefully, to make sure it hasn't been changed.  Often, original dates have been painted over and new dates stamped . 

Original date. Set is a 500C (no dial) (Vermillion code indicates set was refurbished.)	Original numbers painted out New code in vermillion ink.	Original code painted out New code in silver ink. "CONV" = converted	Only model variation  painted out Date not changed! Look for replaced parts.

Parts such as the dial, ringer, cords, plastic shell and all handset components usually also have dates.  These parts are real easy to change, so were often replaced during the phone's useful lifetime.

If your phone has mixed dates,  the interesting dates for it are the dates on the base and network, and the dates of the last refurb or newest component found.

Another exercise for the phone sleuth is to try to determine what the original model number was, if the original model number had been painted over.  Occasionally careful examination of the black paint will show a slight raised pattern caused by the original ink below.  In other cases, remains of the previous model will be left in place.  For example, looking inside the phone from the rightmost photo above revealed a terminal strip near the handset entry hole.  Therefore the original set was probably a 500T, 500J or 500K.  The original 425A network had been removed and replaced with a 425B.  The terminal strip was left in place.

Phones stamped "CONV" usually had the network replaced.  The conversion was from the 425A to 425B.

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COLORS:

Now that you know how many models you need to collect, try finding them in all the following colors, by year!!

The color code was appended to the model number as a suffix.  Dates offered are included, where known.  To view 1983 Western Electric Color Charts, follow these links:  For Phones , or For Components .  (Thanks to Todd Bernstein and David Massey for providing these charts!)

Keychains in "original" colors

WE 500 Colors: 1949 thru 1983 Note: The first color name is typically the one found in the initial BSPs.  Other names were used in marketing literature and often differed among the Operating Companies. Note: Dates are based on first appearance in marketing literature. Sets may be found dated the previous year. -3 Black -29 Transparent (dates unknown)  New in 1953 (Black handset, dial & cord) -50 Ivory, Cameo Ivory, Classic Ivory. -51 Green, Moss Green, Mistletoe Green, Sage Green,  Colonial Green. -52 Gray, Dark Gray, Oxford Gray, Charcoal Gray, Dove Gray. (MD* 1957)  -53 Red, Cherry Red, Cardinal Red, Fiesta Red. New in 1954 (full color or two-tone) -54 Brown, Mahogany Brown, Briar Brown, Autumn Brown. (MD 1957,           continued for keysets for several years)  -55 Beige, Dark Beige, Rose Beige, Rosewood Beige. (MD 1957)  -56 Yellow, Canary Yellow, Sunlight Yellow, Pastel Yellow. -57 Blue, Medium Blue, Dark Blue, Mediterranean Blue, True Blue, Capri Blue, Shadow Blue. (MD 1957)  New in 1957 (two-tone MD) -58 White  -59 Rose Pink    (MD ca. 1978) -60 Light Beige  -61 Light Gray    (MD ca. 1978) -62 Aqua Blue New in 1964 -64 Turquoise   (MD ca. 1978) *MD = Manufacture Discontiued

Late Production (80s) -93 Lemon Yellow -104 Chocolate Brown  -105 Dark Green, Hunter Green  -106 Lime Green   -115 Royal Blue, Dark Blue -123 Butter Yellow  -124 Rust (& Merlin) Gun Metal Grey (Oxford) Peach Salmon For more information on phone colors, see: Phones in Color! WE Color Codes Chart

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HANDSETS: WE G3

How simple could it be?  Although we usually find the G1, G3 and G15 versions, look at all the others out there...

Note that there are several model numbers within each type code, based on cord type and in some cases controls provided.  Some information is presented in the chart, but see the BSPs for details.

MODEL TYPE	DESCRIPTION	BSP
G1	Early standard handset - Bakelite Shell and Caps, Black.  Many were later refurbed with plastic caps (which are often hard to remove!)   Replaced by G3. Some G1 handles were used to make GF handsets.  See GF below. Models include: G1AR (500 sets), G1DR (PBX), G1FR (570-type sets), G1G (coin collectors), G1J (525A and B sets).   G1B had an optional weight (RS-9099) for use with 190 series and lower coin collectors.	C63.341 501-210-102 501-210-300
G2	Early push-to-talk/listen.  Replaced by G5.	C63.341 501-210-102 501-210-300
G3 G3W photo (no Bell System markings) from Jonathan Sowers	Later standard handset - Plastic Shell and Caps. Available in colors. Replaced by G15 (modular). Some G3 handles were used to make GF handsets.  See GF below. Models include: G3AA (525A and B sets), G3AB (PBX), G3AC (570-type sets), G3AR (5,6,700-series sets), G3BR (COPAN - Command Post Alerting Network), G3CR,DR (601-type, 700 series), G3FR (112A key equipment), G3K (coin collector, 750-type), G3L (key mountings), G3M,P,R,S,T (coin collectors), G3Y (2568HP)	C63.341 501-210-102 501-210-300
G4	Shoulder Rest - fits into two holes on handle.  Can be installed to fit either right or left shoulder. See photos. Models include: G4AR (black only), G4B (colors), G4M (modular).  Announced in 1954.	C63.341 501-210-102 501-210-300
G5	Push-to-talk - Has a rectangular push-to-talk bar on the handgrip. Models include: G5AR (mobile radio), G5BR (4-wire circuits, paging),G5CR (FAA, private line systems), G5ER (535 set), G5FR (Bendix MRT9 radio), G5GR (2,4-wire private line stations), G5HR (102-type key equipment), G5JR (#300 switching system), G5KR (2A farm interphone), G5LR (617 set, COPAN), G5MR (Air-ground base station), G5NR (625-type set), G5PR,RR (596E set).	501-210-102 501-210-300
G6	Impaired Hearing - receiver amplifier and volume control in handset.  G6B (late) and G6BM have a 0.02mf cap across terminals R and G.  G6AR has a single stage transistorized amp.  (See G66.)  Introduced in 1961.	501-210-300 501-211-102 501-211-400
G7 (control similar to G6)	Weak Speech - transmitter amplifier and volume control in handset.	501-210-300 501-211-102 501-211-400
G8	Noisy Locations - receiver amplifier with volume control and push-to-listen switch, which decreases transmitter output and increases receiver output.	501-210-300 501-211-102 501-211-400
D-108413	Modified G8B for noisy locations - provides additional receiver gain.  (See G66.)	501-211-102 Addendum I1
G10	Government Agencies for Security Reasons - To listen or talk it is necessary to depress a button in the middle of the handset. These handsets are factory sealed units. Models include: G10A-F.   G10A has two buttons on handle (receive and transmit), G10E has one button controlling both functions.	501-210-301
G11	"Used with 15A, 15B and 15C apparatus which are part of 520A, 520B and 2520C explosion-proof telephone sets.  Designed to provide protection against the probability of explosion resulting from flames originating within the handset under extreme conditions of operation."  (Makes you wonder about the rest of the handsets, doesn't it?)  T3 transmitter, LA1 receiver, aluminum lined cavities.	501-210-102
G12	Early plug-in type cord Uses H4DB cord with Trimline-style plugs.	501-210-103
G13 photo from Jeremy Walters	Impaired Hearing - for coin collector sets Similar to G6B, except uses a slide switch instead of a potentiometer and has an armored cord.  Later handsets used two pushbuttons (as shown).  Switch provides either 10 or 20db gain and spring returns to normal position. Caps are ultrasonically bonded to the handle, therefore components cannot be replaced.	____________ 501-211-102 501-211-400
G15A	Basic handset with modular connection.  Replaced G3 for modular applications. (Model number is not marked on handset, just Bell System markings.)	501-210-103
G36	Long Route Replaces original handset where 3db transmission gain or low current operation is required.  (Only works with rotary dials or touchtone dials equipped with a common switch contact arrangement to prevent dial sidetone amplification, and is polarity sensitive.)  When installed, a sticker was placed on the bottom of the phone, "Equipped with G36 Handset", as there are no user controls visible to indicate the presence of the amplifier.	501-211-103
G66	Impaired hearing Receiver-amplifier unit and polarity guard.  Pushbutton provides an additional 10db gain in the receiver and 10 db loss in the transmitter circuit.  This handset is intended only for use by customers who require more receiver gain than that provided by G6 type handset. Recommended in place of the D-180413 handset.	501-211-102 Issue 6
GF	Handset for 5302.  Uses a G1 or G3 handle, with adapters for HA1 and F1 elements used in the F1 handset.  See photo	502-400-301 NY
732A	This is actually a receiver that looks like a G3 handset.  It has no transmitter element, the cup has no terminals installed and the transmitter cap has no holes! Used on 691A subset.  (732A is in the coding series for receivers.)   See photo	502-200-101
KS-16504	High fidelity dynamic microphone. Used with 8A and 9A announcement systems (to record the message), or as part of a high fidelity conference set.	501-210-120 501-210-300
J1	Control of 1-type telephone reporting set from a remote line.  Similar to G5 with a switch controlled oscillator for generating a 1475 cps signal.	501-210-104
Link to similar info on F Handset Models.

Note: Early models had separate cord retainer parts in the transmitter cavity.  Later models had the retainer molded into the transmitter cup.  The parts are not interchangeable.

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CONTRIBUTORS
Thanks to ATCA and TCI members, including: Rick Walsh, David Massey, Jeremy Walters, Todd Bernstein, David Willingham, John Chalupsky, Steve Hilsz, Steph Kerman, Stan DeOrsey, Steve Schlink, Jonathan Sowers and Vern Potter.

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