GPO, POST OFFICE and BT
|The British Post Office (BPO) purchased telephones and other apparatus from various
manufacturers. On a lot of equipment the manufacturer can be identified by the use of a
manufacturers code. Where a PO
factory code is shown, that means that the equipment has been made or refurbished by
one of the BPO factories. Quite often these codes are on labels stuck over the
top of the original manufacturer’s code.
It is clear that the original single-letter and later double-letter codes were allocated with fairly little regard to any logical meaning. Once all codes were expanded to at least three letters greater care was taken to make meaningful combinations. Existing two-letter codes were expanded by suffixing 'A' to the original code. The list also includes some non-BPO codes commonly found on telephones (AP, YA and Z).
Thanks to many articles from the Telecom Heritage Group, especially the lists compiled by Graham Wooten, Andy Emerson, BT museum and John Ferris.
A Edison Swan Electric Ltd.
AA Pinching & Walton
Trench & Manhole Covers Ltd
AAG Mullards Ltd - London SW18
AB A. C. Brown
AC Nalder Bros. & Thompson
ACL Advance Electronics Ltd. Hainault, Essex.
ACW AVO Ltd - London SW1
AD Spagnoletti (see CN)
AE Medical Supply Association
AEK GEC-AEI Telecommunications, Kirkcaldy, Fife, Scotland
AEG GEC-AEI Telecommunications, Glenrothes, Scotland
AEY AEI Telecomms Group - Worsley Bridge Rd, London, SE26
AEP Automatica Electrica Portuguesa (not a BPO code - found on phone - see Plessey)
AF Armstrong Bros.
AG H.W. Bolt
AH J.H. Tucker & Co.
AJ Consolidated Supply Co.
AK Peel-Conner Telephone Works Ltd - became GEC
AKA Sterling Telephone & Electrical Co. - Dagenham, Essex
AL W. Robinson & Co. Ltd.
AM Wrench Mfg. Co.
AN E.F. Moy Ltd.
ANS Ansaphone Ltd - Camberley, Surrey
AO Beck & Co.
AP King & Scarborough
AP Admiralty Pattern (British Navy). Not a BPO manufacturer code.
AQ Gambrell Bros.
AR Houghton Ltd.
AS Noakes & Sons
ASW Armstrong Stevens & Sons - Willenhall, Staffs.
ATB Automatic Telephone & Electrical Co. Ltd - Bridgnorth
ATL Austin Taylor Electrical Ltd - Bangor, N. Wales
ATK Plessey Telecom Group - Kirby Industrial Estate, Liverpool
ATL Austin Taylor Ltd - Bangor, N. Wales
ATW Automatic Telephone & Electrical Co. Ltd - Wigan, Lancs.
AU J. Russell & Co.
AV Tylers Ltd.
AW W. & F. Dennis & Co.
AX H. White & Co.
AXA H. White & Co. - Yarmouth
AY R. Lambert
AZ R. & J. Irving
BAB AEI Telecommunications, Bristol
B2P Inventec Electronics - Malaysia
BB Brush Electrical Engineering Co.
BBK Bakelite Ltd - Birmingham
BBL Britannia Batteries Ltd.
BC L. Herve Ltd.
BCC Bristol Concrete Co. Ltd.
BCL Bratt Colbran Ltd.
BD W. T. Henley's Telegraph Works Co. Ltd.
BDB W. T. Henley's Telegraph Works Co. Ltd - London (became AEI)
BE Callenders Cable & Construction Ltd (later BEB)
BEB Callenders Cable & Construction Ltd - London E16 (previously BE)
BEL The British Electric Lamps Ltd.
BET The British Electric Transformer Co. Ltd.
BF E. Spencer & Co. Ltd.
BG Johnson & Phillips Ltd.
BH Newton Chambers & Co.
BJ Harcourts Ltd. - Birmingham
BJB Bayliss, Jones & Bayliss Ltd.
BK Magneta Time Co. Ltd (late Silent Electric Clock Ltd.)
BL A. Bocchi
BLD Birkby's Ltd - Liversedge, Yorks.
BM H. Wallis
BN Karabon Co. (see EJ)
BNSF British NSF Co. Ltd.
BO Standard Woodwork Co.
BQ Stockall Marples & Co.
BS Everett, Edgcumbe & Co.
BSD Mullard Radio Valve Co. - Mitcham, Surrey
BT Prescot Clock & Mechanical Co.
BTR Blick Time Recorders Ltd.
BU C.H. Glover & Co.
BUL Bullers Ltd. - Stoke on Trent
BV Brown & Co.
BW Cossor Ltd.
BX Williamson Clock Co. Ltd.
BY G. Welch & Sons
C General Electric Co. - Coventry, originally Peel Conner Ltd. (later GEC)
C Found near a screw terminal - means Carbon and is the positive connection of a primary battery
CB Chubb & Sons Lock & Safe Co. Ltd.
CCA Carron Co (previously CC)
CCB Creed & Co. Ltd - Brighton, Surrey
CCD Creed & Co. Ltd - Croydon, Surrey
CCL Cathodian Crystals Ltd - Needs confirmation may be incorrect or an in house code.
CD Malcolm & Co.
CE Boulton & Paul Ltd.
CF H.W. Sullivan
CG Grimshaw, Baxter & Elliott
CH Alfred Graham & Co.
CJ Ingram Bros.
CK H. White & Co. Ltd. (Watchmakers) - London EC1.
CL Prison Commissioners of Scotland
CLS Concrete Ltd.
CLV Colvern Ltd.
CN Park Royal Engineering Co. Ltd, successors to Spagnoletti (see AD)
CO D.H. Bonnella & Son Ltd.
CP Weston Electrical Instrument Co. Ltd.
CPL Crompton Parkinson Ltd.
CR Crystalate Co. Ltd.
CS E.F. Gurnett
CSB E.S. Gurnett
CT Record Elec. Co.
CTP Creed & Co. Ltd - Pontypridd, Glamorgan
CU G.L. Beasley
CV T.H. Brooker & Co. Ltd.
CW Comyn Ching & Co. Ltd.
CWL Pye Telecommunications - Cambridge. CW actually comes from Cambridge Works originally in Haig Road, Cambridge
CWP The Caxton Wood Turnery Co.
CX E. Brook Ltd.
CY Marconi Wireless Telegraph Co. Ltd.
CYA Marconi Co. Ltd - Chelmsford, Essex
CZ A.P. Buchanan
D India-Rubber and Gutta-Percha Telegraph Works Ltd, Silvertown
DA W. Cowill & Sons
DAE A.P. Besson Ltd - Hove, Sussex
DAW Duct & Access Covers PLC - Wales
DB J. Gell
DBA John Gell Ltd
DBK Bakelite Ltd - Durham
DC The Synchronome Co.
DCA Synchronome Co. Ltd - Wembley, Middx.
DD William, Duncan, Tucker & Sons Ltd.
DE Muirhead & Co.
DEA Muirhead & Co. - Beckenham, Kent
DEK Dover Engineering Co. - Dover, Kent
DF British Telegraph Instrument Co.
DFM Denis Ferranti Meters Ltd - Bangor, N. Wales
DG T.O. Blake
DH Willing & Co.
DJ The Telegraph Construction & Maintenance Co. Ltd.
DJA Telegraph Construction & Maintenance Co. - London SE10 (see S and SEG)
DK Buck & Hickman
DL Drury Bros.
DM Vaughtons Ltd.
DMR Dynamo & Motor Repairs Ltd.
DN H.J. Dawes
DNT E. Dent & Co.
DO Grant, Cameron & Curle
DP Cheshire, Pooley & Co.
DR Berry Skinner
DS S.G. Jones
DT J. Gerrard & Sons
DV Creed & Co.
DW Repetition Woodwork Co.
DY Staples & Co.
DZ Relay Automatic Telephone Co.
DZA Relay Automatic Telephone Co.
E Ericsson Telephones Ltd (British Ericsson) - later Plessey, then GPT and then Siemens
EA N. Berry & Sons
EB Francis & Sons
EB Found near screw terminals - means Extension Bell
EBL Edison Bell Ltd.
EC C. Lange
ECS English Clock Systems
ED The Waltham Cross Joinery Co. Ltd.
EE Isenthal & Co.
EEC Elliott Ltd - West Midlands
EET Plessey - Beeston, Notts. (formerly Ericsson, see E)
EEX Plessey - Sunderland (formerly Ericsson)
EF Albion Iron & Wire Work Co. Ltd.
EFW F.W. Elliott Ltd.
EG S.E. Norris & Co.
EH Cambridge Instrument Co. Ltd.
EHA Cambridge Instrument Co. - London SW1
EJ C.A. Apperley (Karabon)
EK Clacton Joinery & Engineering Co. Actually part of E. K. Cole
EL Davis & Timmins
EM The BKB Electric Motors Ltd.
EMI EMI (Valve Division) - Ruislip, Middx.
EN The British Time Recorder Co. Ltd.
ENA British Time Recorder Ltd - London EC1 (previously EN)
EP Potter & Co.
EQ Anode Ltd.
ER Bonnella Bros.
ERM Epoch Radio Manfg. Co. Ltd.
ES Wm. Sanders & Co.
ESC Enfield Stone Co. Ltd.
ET Baxendale & Co. Ltd.
EU Burnham & Co.
EV G.W. Evans & Co.
EW Baxter & Caunter
EX C.A. Carter & Co.
EY Buckleys (London) Ltd.
EZ Zenith Manfg. Co. Ltd.
F GEC Ltd.
FAC Fuller Accumulator Co. (1926) Ltd.
FB GPO Factory, Birmingham
FBR GPO Factory, Fordrough Lane, Birmingham (repaired apparatus, special cases only)
FC Alex. Bruce & Co.
FD Messrs. Hailwood & Ackroyd Ltd.
FE Dubilier Condenser Co. (1921) Ltd.
FEL Fidelity Ltd (see FID)
FF Eclat Electric Lamp Manufactory
FG Burt, Boulton & Haywood Ltd.
FGB Sontranic Ltd - Edgware, Middx.
FH GPO Factory - Holloway
FHA GPO Factory - Holloway, London (Assembly)
FHB GPO Factory - Holloway, London (Construction)
FHR GPO Factory - Holloway, London (repaired apparatus, special cases only)
FID Fidelity Radio Ltd (see FH)
FJ The D.P. Battery Co. Ltd.
FJM F.J. Moore Ltd.
FK The Alton Battery Co. Ltd.
FL The Accumulators of Woking
FM Foster's Machine Tool & Engine Co.
FMC Calne Electronics - Calne
FNB GPO Factory - Edinburgh (Construction) (the N stood probably for ‘North Britain’)
FNR GPO Factory - Edinburgh (Refurbish)
FR Ferranti Ltd.
FRA Ferranti Ltd - Hollinwood
FS The Foster Engineering Co. Ltd.
FT Messrs. F. Tray & Co. Ltd.
FW GPO Factory - Wales (Cwmcarn)
FWG STC Consumer Electronics - Cwmcarn (formerly BT factory)
FWR GPO Factory - Cwmcarn, Wales (Refurbish)
G General Electric Co (GEC) - see C
GAB Greenwood and Butler - Leeds
GB Jas. Gibb & Co. Ltd.
GC East & Son Ltd.
GE G. Bruce
GEC GEC Telephones - Coventry
Osram Lamp and Lighting Co. Ltd - Gateshead, Co. Durham
GEH GEC - Middlesbrough
GEL GEC-AEI Telecommunications - Accrington, Lancs.
GEN GEC-AEI Telecommunications - Newton Aycliffe, County Durham
GEP GEC Telecommunications Ltd - Treforest, Pontypridd
GF Girlings Ferro Concrete Ltd.
GJ Gillett & Johnston
GKT GKN PLC - Telford, Shropshire
GM G. Mugford
GNA Pye, Aidrie (TMC from 1970) - see TMA
GNT The Great Northern Telegraph Co. Ltd. of Denmark
GS Gillson Syndicate
GTE Ferranti joint venture with GTE (USA)
GZ Doulton & Co.
H Automatic Telephone & Electric Co (ATE) (formerly ATM, H stands for Helsby)
HA Hall Telephone Accessories Ltd. (later HAS)
HAA Automatic Telephone & Electrical Co. - Liverpool (later Plessey)
HAS Hall Telephone Accessories Ltd (formerly HA)
HB Houghton Butcher Manfg. Co. Ltd.
HC British Insulated Cables Ltd.
HCA BICC Cables - Warrington
HCC BICC - Liverpool (ex Helsby Cables)
HCL BICC - Leigh (ex Helsby Cables)
HCP BICC - Prescot (ex Helsby Cables)
HD C.A & A.W. Hayward
HDL Hudson's Electrical Devices Ltd - London SW2
HE H. Sloog (makers of Hennite)
HEA H.E. Ashdown (Birmingham) Ltd.
HF Eames Bros.
HG Hart Accumulator Co. Ltd.
HH J.E. Hough Ltd.
HJ C. Hodges & Co. Ltd. (business purchased by J.L. Gottlieb & Co. Ltd.)
HK Hillcrete Ltd.
HL Holland & Sons Ltd.
HM Chamberlain & Hookham Ltd.
HN J. Hannan
HND Highton & Sons - Dalston, London, E8
HR Henry Brown & Sons
HS Howells & Co.
HT A.W. Hart
HVA Plessey Hivac Division - Ruislip, Middx (ex Hivac Ltd)
HY G.A. Harvey & Co. Ltd.
I (originally) International Electric Ltd.
I (later) Ibex, London (later IBX)
IA British Die Casting & Engineering Co. Ltd.
IB G.H. Bartlett
IBX Ibex Telephones - Harrow, London (formerly I)
IM Imperial Typewriter Co. Ltd.
IMP Imperial Typewriter Co.
IT International Time Recorder Ltd
JA J.A. Crabtree & Co. Ltd.
JB B.W. Johnson
JC J. Chesterman & Co. Ltd.
JGS Switchgear Co.
JK Brooker and Jackson Ltd.
JKA Brooker and Jackson Ltd. - London N1
JM J. McKenzie & Co.
JN John Norman Ltd.
JR Joseph Reynolds
JS J. & E. Bates
JX Julius Sax & Co. Ltd.
JXA Julius Sax & Co. Ltd.
K Kelvin, Bottomley & Baird Ltd.
KA Calders Ltd.
KB K. E. Beswick - Frome, Somerset
KC E.A. Combs
KCP Kent Concrete Products
KD J. Cadman & Co. Ltd.
KE Chloride Electrical Storage Co. Ltd.
KEC E. K. Cole Ltd - Rochford, Essex (later EKCO Avionics)
KJ J. Crombie & Son
KKA E. K. Cole Ltd - Southend, Essex
KL The Crypto Electrical Co. Ltd.
KM The Camelinat Co.
KNE K & N Electronics Co. Ltd - Maidenhead, Berks.
KQ Craig Lelo Quarry Co. Ltd.
KR Cryselco Ltd.
KRN Krone - Cheltenham
KS Carver & Son
KT The Croft Granite, Brick & Concrete Co. Ltd.
KU The Concrete Unit Co. Ltd.
KZ L. Keizer & Co. Ltd.
L Elliott Brothers Ltd
LDA Cossor Communications Co. Ltd - Stanmore, Middx.
LE Litholite Insulators Ltd.
LEA Litholite Mouldings Ltd - Leicester (ex-Watford)
LEB Elliott Bros. (London) Ltd - London SE13 (previously L)
LER Lero Engineering Company - Coventry
LF Lion Foundry Co. Ltd. - Kirkintilloch, Glasgow (later LFA)
LFA Lion Foundry Co. Ltd. - Kirkintilloch, Glasgow (previously LF)
LK W. & T. Lock
LN Lissen Ltd.
LP Lindsay, Parkinson & Co. Ltd.
LR Thomas De La Rue
LS Lang & Squire Ltd.
LUS Lustraphone Ltd.
LWA Lightwood & Son - Birmingham
M (originally) P.O. Factory, St Johns Road, Dublin (derived from the Irish word for factory ‘Monarca’)
M (later) W. Maxwell & Co. Ltd.
MA Males & Andrews
MCA P. McAinch Ltd.
MD B.D. & Co. (Edward A. Boynton)
ME F.W. Male & Son Ltd.
MF Walter Macfarlane & Co. - Glasgow (later MFA)
MFA Walter Macfarlane & Co. - Glasgow (previously MF)
MH A.G. Matthews
MK Marconi Scientific Instrument Co.
ML C.A. Middleton Ltd.
MM The Condenser & Electric Co. (originally)
MM Murphy Radio Ltd - Welwyn Garden City, Herts. (later)
MN Metropolitan Vickers Electrical Co. Ltd.
MOV M.O. Valve Co. Ltd - London W6
MP Moulded Products Ltd.
MRL McMichael Ltd.
MS Mead Ltd (originally)
MS McDowell Steven & Co. - Falkirk (afterwards, later MSL)
MT Moore & Wright Ltd.
MTW Modern Telephones Ltd - Wimbledon, London SW19
MTJO Mullard Ltd - London WC1
MTC Millars' Timber & Trading Co. Ltd.
MU Murray (c/o Reid Bros., see R)
MV Mullard Radio Valve Co. Ltd.
MW Micklewright Ltd.
MWB Marconi Wireless Telegraph Co. - Basildon, Essex
MXB Motorola - Basingstoke, Hants.
N Nalder Bros.
NB Newton Bros (Derby) Ltd.
NE North of England School Furnishing Co.
NJ British Nigerian Timber Co.
NS Neill, Small & Sons
NTS The Norton Boys' Home
NW Norwest Construction Co. Ltd.
O Gent & Co. (later OAA)
OAA Gent & Co. - Leicester (previously O)
OD D.M. Davies
OM Oldham & Son
P R.W. Paul Ltd
& Co. Ltd.
PBI Plessey – Ballynahinch, N. Ireland
PC H.M. Prison Commission
PCB Plessey - Whiteside Works, Bathgate, West Lothian (see PLF)
PE The Power Equipment Co. Ltd.
PEH Pye - Hastings
PER Plessey Electrical Equipment Division - Romford, Essex
PG The Pitter Gauge & Precision Tool Co.
PGH Pirelli - Eastleigh, Hants.
PGL Pirelli - Southampton
PH W.G. Pye & Co. Not actually part of PYE Group after the sale of PYE Radio to C. O. Stanley, it was a separate company producing Scientific Instruments
PK Chas. Peacock & Co. Ltd.
PL The Plessey Co. Ltd. - Ilford, Essex (later PLA)
PLA Plessey - Ilford, Essex ( also TLA, previously PL)
PLF Plessey - Whiteside Works, Bathgate, West Lothian
PLS Plessey - Kemberry Rd, Swindon, Wilts.
PLJ Plessey - Upminster, Essex
PLV Plessey - Havant, Hants.
PLW Plessey - Cheney Manor, Swindon, Wilts.
PLX Plessey - Newport, Gwent
Plessey - Titchfield
PM Reliance Telephone Co. Ltd - Birmingham
PMC A.T.E. (Wigan) Ltd - Pioneer Works, Wigan, Lancs. (see PML)
PML A.T.E. Ltd - Chorley, Lancs.
PN Radio, Phonopore and Electricals Ltd.
PR The Premier Accumulator Co. (1921) Ltd.
PS The Parkside Engineering Co. Ltd.
PSD Plessey - Dublin, Ireland
PSL Poulton Selfe & Lee Ltd - Wickford, Essex
PTB Pye Thermal Bonders
PTE Pye Telecommunications Ltd - Ekco Works, Southend, Essex (see KKA)
PTL Pye Telecommunications Ltd - PTL was the designation of PYE, Ditton works, Newmarket Road, Cambridge. Later it was St Andrews Road new Factory which replaced Ditton Works and Quy Mill research centre.
PW Palmer & Waumsley
PX Phoenix Telephones & Electrical Works Ltd. - London NW9 (later PXA)
PXA Phoenix Telephones & Electrical Ltd. - London NW9 (formerly PX)
PYE Pye Telecommunications. Ltd. - Cambridge (see CWL)
PYI Pye Radio Ltd. - Cambridge
PYL Pye Radio Ltd. - Leicester
PYT Plessey - Taplow, Maidenhead, Berks.
PZ Pritchett & Gold and E.P.S. Co. Ltd.
R Reid Bros.
RA Radio Instruments Ltd.
RAA Landis & Gyr (formerly Aeronautical & General)
RAW Roberts & Armstrong (Engineers) Ltd - Wembley, Middx.
RBA Reid Brothers (Same as W Reid & Co.?)
RC Ross, Courtney & Co.
RD W. & M. Richmond & Co.
RE Reliable Engineering Co.
RF Royal Gun & Carriage Factories
RH Ruston & Hornsby Ltd.
RIA Rathdown Industries Ltd - Ascot, Berks.
RLA Ryford Ltd - Aldridge, Staffs.
RLE Ripaults Ltd - Enfield, Middx.
RML Rotheroe & Mitchell Ltd - Greenford, Middx.
RNA Radio, Phonopore & Electricals Ltd (Sterling took over)
RR R. Robertson
RS Radio Supplies
RT Robert Edwards
RTL Racal Transcom Ltd - Salisbury, Wilts.
RTN Reliance Telephone Co. Ltd - Birmingham
RV Revo Electric Co. Ltd.
S Siemens Bros. & Co. Ltd. - Woolwich, London SE15 (later SEG)
SA The Saunders Electrical Co.
SAV W. Bryan Savage
SB S.G. Brown Ltd.
SBD Stonebridge Electrical Co. Ltd.
SBM Salford Electrical Instruments - Manchester
SC L.C. Smith & Corona Typewriters Ltd.
SCP Surrey Concrete Products Ltd.
SD S. Davall & Sons
SE Small Electric Motors Ltd.
SEA Siemens-Edison Swan - London N17 (became part of AEI)
SEC Salford Electrical Instruments - Heywood, Lancs. (part of GEC)
SEG AEI Ltd - Woolwich, London SE18 (ex Siemens, see S)
SER AEI Ltd - West Hartlepool, Co. Durham (ex Siemens)
SEW Siemens Edison Swan - Woolwich, London SE15 (see SEA)
SF Scofield & Flexton
SFC Standard Fuse Co.
SG G. Salter & Co. Ltd.
SID Salmon Industries Ltd - Northern Ireland
SL S.G. Leach & Co. Ltd.
SLW Speke Telephones Ltd - Wilmslow, Middx. (see SPK)
SM Stuart & Moore (taken over by G. Longfield-Beasley)
SN Solidite & Synthetic Mouldings Ltd.
SP Small Power Dynamo & Motor Co. Ltd.
SPK Plessey - Speke, Liverpool (ex Speke Telephones Ltd., see SLW)
SR Estler Bros.
SS Ebonestos Insulators Ltd.
SSA Ebonestos Industries Ltd - London SE15 (previously SS)
SSG Splintex Safety Glass Co - London W7
SSL Siemens-Schuckert (Gt. Britain) Ltd.
SSS S. Smith & Sons (Motor Accessories) Ltd.
SSS Smith's Industrial Instruments Ltd - London NW1
ST Stuart Turner Ltd.
STC - New Southgate, London N11
STD STC - Footscray
STC (Valve Division) - Paignton, Devon
STK STC – Boreham Wood
STC - Monkstown, N. Ireland
STC – East Kilbride
STC – Enfield
STW STC - Taunton
SU The Educational Supply Association Ltd.
SUE Submarine Cables Ltd - Erith, Kent
SUG Submarine Cables Ltd - Greenwich, London SE3 (see DJA and S)
SUR Siemens Halske - Germany
SV D.G. Somerville & Co. Ltd.
SY H.C. Slingsby
T Tyer & Co.
TA Thermega Ltd.
TB Turner Bros. Ltd.
TBE Telerelays Sales Ltd -Braintree, Essex
TCC Telegraph Condenser Co.
TCD Telephone Cables Ltd - Dagenham, Essex
TCE STC - Enniskillen, N. Ireland
STC - Larne, N. Ireland
TCJ STC – Jenny Mount (Belfast), N. Ireland
TCL Trent Concrete Ltd.
Team Concepts International Ltd (Hong Kong)
STC – Treforest
STC – Rhyl
TCS STC – Chase Side
TD H.J. Townsend
TE Telephone Manufacturing Company (formed 1915, later TEA)
TEA TMC - Dulwich, London SE21
TES TMC - St Mary Cray, Kent (from 1939)
TEW TMC - Winsford, Cheshire
TF Timber Fireproofing Co. Ltd.
TG Tungstone Accumulator Co. Ltd.
TGR Thorn Ericsson - Rochester, Kent
TGW Thorn Ericsson - Scunthorpe
TH The British Thomson-Houston Co.
TK The Bradford Patent Truck & Trolley Co.
Telegraph Co. Ltd.
TLA Plessey - Ilford, Essex (also PLA)
TM Telephone & Microphone Co.
TMA TMC - Airdrie, Lanarkshire (see GNA)
TMC Telephone & Microphone Co.
TMK TMC - King's Lynn, Norfolk
TM TMC - Malmesbury, Wilts.
TN J.W. Thomson
TP Thornton Pickard Manfg. Co.
TPC TMC Transmission Division - St. Mary Cray, Kent
TR Ernest Turner Electrical Instruments Ltd. - High Wycombe (later TPA)
TRA Ernest Turner Electrical Instruments Ltd. - High Wycombe (formerly TR)
TS The Thames Manfg. Co. Ltd.
TSD Telephone Supplies Ltd - Aycliff, Co. Durham
TT Taylor, Tunnicliffe & Co. Ltd.
TTC Taylor Tunnicliffe & Co. Ltd. - Lastwood, Hanley, Staffs.
TTH TMC - Canterbury, Kent
TTL TMC - Livingstone, Bathgate, West Lothian (from 1969)
TU The Tudor Accumulator Co. Ltd.
TW Tate & Wilkinson
TY H. Tinsley & Co.
TYA H. Tinsley & Co.
U Walters & Co.
UAA Walters Electrical Manufacturing Co. Ltd - London (previously U)
UG United Woodworking Co. Ltd.
UME Multitone Ltd.
UW Underwood Portable Typewriters Ltd.
V T. Watson
VA The Varley Magnet Co.
VD The Ever Ready Co. (Gt. Britain) Ltd.
VG Evershed & Vignoles Ltd. - London W4. Later VGA
VGA Evershed & Vignoles Ltd. - London W4 (previously VG)
VK Vickers Ltd.
VLC Varta Ltd - Crewkerne, Somerset
VN Vanesta Ltd.
VS Evans Bros. Ltd.
VTS Venner Time Switches - New Malden, Surrey
VV C.A. Vandervell & Co. Ltd.
VW Visible Writing Machine Co. Ltd.
W STC - North Woolwich, London (Western Electric pre-1925, see WAA)
WAA STC - North Woolwich, London E
WAB STC - Newport, S. Wales
STC - Basildon, Essex
WAF STC - Southampton
WAS STC - Southampton
WB Westinghouse Brake & Saxby Signal Co. Ltd.
WC Walsall Conduits Ltd.
WEA Weatherlite Ltd.
WEE W.E. Eaton
WER Whiteley Electrical Radio - Mansfield, Notts.
WF W.H. Foster & Sons Ltd.
WG Ward & Goldstone Ltd.
WH Wm. White & Co.
WI Webb & Wells - Ilford, Essex
WJ Walter Jones & Co. Ltd.
WK L. Weekes Ltd.
WS M.W. Woods
WW The Wilson Wolf Engineering Co. Ltd.
YA British Army line stores prefix (not a BPO manufacturer code)
Z Negretti & Zambra Ltd.
Z Found near a screw terminal - means Zinc and is the negative pole of a primary battery
ZA British Army wireless stores (not a BPO manufacturer code)
ZEA Zenith Watch Co. Ltd (GB) (Previously ZE)
ZE Zenith Watch. Co. Ltd. *Gt. Britain)
BLD or BLtd Birkby's of Liversedge (W. Yorks.), the plastics moulding division of Plessey.
C GEC Ltd (Telephone Works, Coventry)
G GEC Ltd
LR Thomas De La Rue Ltd,
MPL Moulded Products Ltd
Siemens Brothers Ltd.
All BPO telephone sets (also equipment large and small) carried a ‘title number’, in which table telephones, portable telephones and piece parts such as handsets carried even numbers whilst wall telephones had odd numbers. Special and experimental telephones had numbers prefixed SA (Subscribers’ Apparatus), whilst designs inherited from the former National Telephone Company were prefixed NT.
As well as the title number, telephones normally carried a mark number and
the date of manufacture. The original design is known as Mark 1, the first
modification as Mark 2 and the second as Mark 3 (and so on). Earlier on original
designs and modifications were identified by three digits, starting with 234,
for the original design, then 235 for the first modification, 236 for the second
modification and so on.
Examples:Telephone 162 C34/1 indicates title number 162, made by GEC in 1934 to the Mark 1 design. Under the older scheme of marking this would have been shown as
Moulded items carried a letters and number code in which the upper two letters indicated the item manufacturer, the lower two letters the moulding subcontractor and the numeral the type of moulding material.
PMG manufacturer codes
Last revised: January 09, 2011