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IDENTIFICATION Markings used on THE BASE OF GPO TELEPHONES

 

GPO telephones usually had identifying marking on their base. This normally consisted of a 3 digit number indicating the type of telephone. This was sometimes followed by a suffix code used to indicate a feature of the phone. Next there were one, two or three letters to indicate the manufacturer. Then came two numbers which were the last two digits of the year. Finally came a number and sometimes a letter to show a change in production. 

The example above gives the following information about the telephone:
  •    706  type No: 706
  •    L  dial marked with letters
  •    PLA  made by Plessey
  •    64  made in 1964
  •    2A  production run 2A

Suffix Codes
 CB  Central Battery (no dial)
 F  All-figure dial or dial surround
 L  Letters and numbers on dial or dial surround
 LB  Local Battery (dial fitted)
 R  Recall button fitted

Manufacturer's Codes
 AEG  GEC Telecommunications, Glenross, Scotland
 AEK  GEC-AEI Telecommunications, Kirkaldy, Scotland
 C  General Electric Company (GEC), Coventry
 CWL  Pye Telecommunications, Cambridge
 DAE  A. P. Besson Ltd., Hove, Sussex 
 DFM  Denis Ferranti Meters Ltd.
 E  Ericsson
 EET  Plessey, Beeston, Nottinghamshire (formerly  Ericsson)
 EEX  Plessey, Sunderland (formerly Ericsson)
 FB   GPO Factory, Birmingham
 FBR  GPO Factory, Birmingham (Refurbished)
 FH  GPO Factory, Holloway, London
 FHA  GPO Factory, Holloway, London (Assembly)
 FHB  GPO Factory, Holloway, London (Construction)
 FHR  GPO Factory, Holloway, London (Refurbished)
 FNR  GPO Factory, Edinburgh (Refurbished)
 FRA  Ferranti Ltd.
 FH  GPO Factory, Holloway, London
 FW  GPO Factory, Cwmcarn, Wales
 FWG  STC Consumer Electronics, Cwmcarn, Wales
 FWR  GPO Factory, Cwmcarn, Wales (Refurbished)
 G  General Elecric Company (GEC)
 GEC  GEC Telephones, Coventry
 GEN  GEC-AEI Telecommunications, Newton Aycliffe, County Durham
 GNA  Pye (laterally TMC), Aidre
 H  Automatic Telephone & Electric Company
 HAA  Plessey Strowger Works, Liverpool
 I  Ibex Telephones, Harrow
 IBX  Ibex Telephones, Harrow
 PEH  Pye, Hastings
 PER  Plessey, Romford, Essex
 PL  Plessey
 PLA  Plessey
 PLS  Plessey, Swindon
 PLX  Plessey, Newport, Gwent
 PX  Phoenix Telephones, Hendon, London
 PXA  Phoenix Telephones, Hendon, London
 S  Siemens Brothers (laterally AEI)
 SER  Siemens, West Hartlepool
 SLW  Plessey, Wigan
 SPK  Plessey, Speke, Liverpool
 STC  Standard Telephone Company (STC), New Southgate, London
 STM  Standard Telephone Company (STC), Belfast, Northern Ireland
 TCH  Standard Telephone Company (STC), Larne, Northern Ireland
 TE  Telephone Manufacturing Company (TMC)
 TEA  Telephone Manufacturing Company (TMC), West Dulwich
 TES  Telephone Manufacturing Company (TMC), St. Mary Cray
 TGR  Thorn Ericsson, Rochester
 TGW  Thorn Ericsson, Scunthorpe
 TMA  Telephone Manufacturing Company (TMC), Airdrie
 TSD  Telephone Supplies Ltd - Aycliff, Co. Durham
 TTL  Telephone Manufacturing Company (TMC), Livingston, Scotland
 W  Western Electric (laterally STC)
 

                                A more exhaustive list of codes manufacturer's codes is available on Bob Freshwater's site


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