STC TELEPHONE No. 2724, 2725, 4001, 4002 & 4004

How to wire an Antwerp phone to work in the UK

Click here for more on the 2724 and 2725

STC ‘Antwerp’ phone

bell2724.gif (32197 bytes)

Model No. 2724

The STC type 4001 (table model),  telephone, nicknamed the Antwerp or Deco phone by collectors, is found in both desk and wall versions.  Although very much a British telephone, It has a strange Continental look to British eyes, which is not surprising considering its origin.

Around 1932 the Antwerp factory of the Bell Telephone Manufacturing Company (BTMC) was entrusted with the task of designing a universal wall and desk telephone that could be sold by all European subsidiaries of the International Standard Electric Corporation.  STC in Britain was one of those companies and they needed a one piece set for their PAX's.  The telephone was later made at the New Southgate factory of STC. 

For the UK market the design was modified to take a BPO No. 10 dial.  All the early STC telephone had black dial finger plates until around 1936 when they changed to the stainless steel.

The early telephones can be identified by the engraved lines moulded into the 'ears' of the cradle, making them look rather like cats paws, but these were dropped after the 2nd World war and later produced telephones just had plain "ears".

bell2724.gif (32197 bytes)

Early style handset cradle

The handset used in Britain has an American look and is also similar to that used on the standard 1924 model of France and some UK Dictograph telephones.  The same base plate is used for both the table and wall sets, which was said to make conversion easier.


The Model 2724 was the original, made by BTMC in Belgium.  It was introduced in 1932 along with a wall model, the 2725.

STC type 4001-C (table model) STC type 4004-B (wall model)

Externally identical telephones were used in Belgium, Czechoslovakia, Hungary, Italy and doubtless several other countries, the only variations being in the design of handset, pattern of dial and internal circuit details, which were tailored to the needs of each country.

After the war STC supplied 332 look a likes with STC's own type numbers (also in the 300 series).

Roger Conklin adds:
I note that the STC Telephone catalogue showing the same moulded Bakelite telephones (but with different catalogue numbers, since they were equipped with the BPO dials) was dated 8-32.  I assume this was August 1932.   These Bakelite sets are described in Electrical Communication Vol. XIV July 1935 Number 1, in an article titled "Developments in Subscriber Sets," by L Schreiber of BTMC, but it does not state when this telephone was introduced.   This is substantially the same as the ITT and Ericsson sets made in Hungary and those made by Standard Electrica in Brazil and Argentina, continuing well into the 1960s.

A 2724 subscriber telephone, has been seen,  with a near-perfect Standard Villamoss'gi R. T. decal, indicating it was made in the Hungarian factory.   This telephone is identical, except for the dial finger wheel, to the same model made by Bell Telephone Manufacturing in Antwerp, and other ITT factories in Europe and South America.   The Hungarian finger wheel has a curved ‘window’ above the centre for the number card, rather than a round number card typical of 2724 sets made elsewhere. (There is a detailed description of the 2724 set in the July 1935 issue of ITT's journal Electrical Communication.)

It is worth noting that the same telephones can be found with an engraved metal badge with the familiar Ericsson script and the words MAGY. VILL. R.T.  The Austrian version of this was manufactured by Czjeia, Nissl & Co (later Standard Telephon & Telegraphen AG).

The GPO took pictures of the STC 4089 which may have been taken during an assessment.

Different variants were also produced. As well as a model with a recall switch the phone was also made into an intercom with 6 press buttons in place of the dial.

Colours: Numerous colour ways were supplied.  In Britain the standard colour was black, with a choice of black or green cords, but orders could also be accepted for jade green, Chinese lacquer red, ivory, old gold and oxidised silver.  The Belgian catalogue lists 16 colours: black as standard or by special order white, cream, oak, walnut, light mahogany, dark mahogany, brown, red, dark red, maroon, light blue, dark blue, light green, green and dark green.  Black and green are the only colours seen by the author; the green was achieved by spray painting (and probably so were all the other colours).   There was also an imitation wood model.

Users: The Antwerp telephone saw limited use on PAX systems installed by STC, whose major customers were the LNE Railway, many electricity boards and some hospital groups.  A note on the circuit diagram referring to Rotary exchanges may refer either to STC's own Rotary PAX's or else may imply these telephones were supplied to Hull Corporation's public system.

Locations where Antwerp phones were used for certain were Croydon Airport and on the Southern Railway at Victoria Railway Station UAX, London.  The design, made by BTMC in Antwerp,  was adopted for public use by the Belgian, Czech,  Dutch and Hungarian state telephone administrations (and probably many others).  The design was used additionally in Spain and south America, and it was also made by FACE Standard in Italy and is found labelled with the name of Ericsson in Hungary.  On this basis it may rank as one of the most prolific and successful telephone designs ever made.

Model 4001


Model 4002G with Chinese dial (Picture dated 1934)


Model 4002G with Egyptian dial (Picture dated 1934)


Model 4004B


Additional Information
by Herbert Schwarz

The type manufactured by Czeija, Nissl & Co. of Vienna, Austria, was built with two distinctly different types of Bakelite housing.  One type had a protruding dial, while the other variation had a sunk dial, whereby the finger wheel was almost flush with the housing. 

Protruding dial variant

Sunken dial variant

I have seen variations of the CN type... it is usual to find the fixed portion of the handset cradle with different logos.  Most common is simply the two letters 'CN' in a wide, flat ellipse, centred on the lower portion of the same.  Some of these phones carry a 'VTT' logo instead, which refers to CN as the 'United Telephone and Telegraph Factory, Joint-stock Company' (Vereinigte Telefon und Telegraphen - Fabriks A.G., Czeija, Nissl & Co.)

CN Logo

VTT Logo

CN also manufactured the exact same style of phone, sans logo, as well.  These phones were sold to other private telephone enterprises and in one case, to the Viennese branch of the German firm 'GEFAT' (Gesellschaft fuer Automatische Telefonie; Company for Automatic Telephony, later known as TN 'Telefonbau und Normalzeit').

The CN phones were used with electromechanical PABXs designed and built by the same, which were either sold outright to customers, or rented/leased to them.  In this case, the handset was the one shown in the pictures.  However, CN also sold such PABXs to the Austrian PTT and in this case, the handset was a different one, namely that of the Austrian PTT standard W48 model telephone (the PTT insisted upon this).

Hungarian and Foreign Company, Vienna

Manufactured by Standard Electric DOMS A SPOL in Prague, Czechoslovakia

As to colours, CN made some that were was once pure snow white.  These were NOT painted white; the Bakelite is white though and through.  This specific colour of Bakelite is pretty brittle stuff, and very fine, dirty, stress cracks can be seen in the handset handle on left hand telephones below.   It is wholly senseless to attempt and polish these stress cracks out as the grime simply gets more noticeable than before.  As to the colours red and green, well, I have never seen one of these phones in anything other than black or white, but I do know that your garden-variety Austrian PTT model W48 telephone was offered in green and red (as well as the more standard colours of creme and black), so that it seems likely that CN would have offered their phone in at least these two colours as well.


Just like British 200 types some of these phones go brown due to the saw dust in the Bakelite.  The phone in the next picture is a black VTT variant which has gone brown.


PBX / Plan system variant
The one entitled 'small CN PBX 2' may be of special interest to you, as it shows one of these typical CN phones with two pushbuttons and two indicator lamp lenses on the front of the housing skirt (not to mention that, although difficult to see, this phone [and the master] have the standard 1948 Austrian PTT model handset.)  This type of PBX was run on positive ground, 24v D.C. power to operate the relays inside the apparatus cases, which were wall-mounted.  The picture below shows a master phone and one of the extensions standing on top of the apparatus cases.


One of the pushbuttons was used to seize the intercom line between the extension and the master phone.  If the intercom line was busy, this would be indicated by the white lens being illuminated.  Depressing the other pushbutton would connect the extension to the outside line; if some other station were already using the outside line, then the red lens would be illuminated.



How to wire an Antwerp telephone for UK lines

To Diagram LP 39275

  1. Remove the old line cord.
  2. Remove the strap between E and L1.
  3. Red of line cord to L2.
  4. Blue of line cord to E.
  5. White of line cord to L1.
    Green of line cord is spare and should be insulated.
  6. Remove brown wire from capacitor. Leave red wire in situ.
  7. Connect 3.3k resistor, one end onto the disconnected brown wire, the other end onto L1.
  8. Install a rectifier element across TR and R to prevent loud bangs in the earpiece.

To diagram 9814AG4

  1. Remove the old line cord.
  2. Remove the strap between E and L1.
  3. Red of line cord to L2.
  4. White of line cord to L1.
  5. Green of line cord is spare and should be insulated.
  6. Remove red / black wire from capacitor.
  7. Connect the blue of line cord to red / black wire (above) and insulate.
  8. Connect 3.3k resistor between E and L1.
  9. Install a rectifier element across TR and R (also numbered 2 and 3) to prevent loud bangs in the earpiece.


To diagram 9814AG4

  1. Remove the old line cord.
  2. Remove the link between L1 and E.
  3. Red of line cord to L2.
  4. White of line cord to L1.
  5. Green of line cord is spare and should be insulated.
  6. Remove red  wire from capacitor.
  7. Connect the blue of line cord to C.
  8. Connect a 3.3k resistor between E and L1.
  9. Install a rectifier element across TR and R to prevent loud bangs in the earpiece.

To diagram AP209753 (Model 2725)
  1. Remove the old line cord.
  2. Remove the link between C2 and b.
  3. Remove the link between a and s.
  4. Connect a 3.3k resistor between a and s.
  5. Red of line cord to a.
  6. White of line cord to b.
  7. Green of line cord is spare and should be insulated.
  8. Connect the blue of line cord to C1.
  9. Install a rectifier element across MR and R to prevent loud bangs in the earpiece.
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Last revised: December 03, 2022