Introduced in 1952, this Bakelite cased, combined handset wall telephone was used by the BPO in C.B. and Automatic exchange areas.  It was the wall equivalent to the table Telephone No. 332.

Produced in the colours; Black, Chinese Red, Ivory and Jade Green.

The telephone has no additional press buttons.

The phone case is released from the back plate by one screw on the right hand side of the case.  The whole body, complete with chassis, swings open to the left, away from the back-plate which is fixed to the wall via three stand offs stamped into the base plate.

This telephone only used the Telephone No. 164 (Mark 2A) as the handset, so the telephone is also a Mark 2A with no Mark 1 or 2 ever produced.

The case to backplate fixing screw is 2BA (1/DCO/32).

This phone was superseded by the Telephone No. 333.

Supplied to the BPO by British Ericsson (ETL), their CB model No. N1421.

Diagram for telephone circuit - N499.

Drawing - 63789.

Keys for use in 300 type Wall and Table Telephones

How to wire the Telephone No. 399 to make it work on Plug and Socket

History, Technical and General Information on 300 type telephones

Development of the Bakelite Wall Telephone

Collectors information

Comparison chart of GPO 300 type telephones

Click here for an article from the Ericsson Bulletin



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Last revised: April 10, 2023