Bakelite cased wall telephone, introduced in 1956 and used by the BPO in CB and Auto areas on direct exchange lines.  This telephone has an AC bell ringer.

Offered as an alternative to the table model, Telephone No. 232.

This model had no provision for push buttons.

Made for the BPO by British Ericsson, Model No. N1086A.

Circuit diagram N433.

Click here for the circuit diagram - Web users - CD users

History, Technical and General Information on 300 type telephones

Collectors information

How to wire your Telephone No. 333 to make it work on Plug and Socket

How to restore Bakelite

Click here for Button labels  - Web users - CD users

Keys for use in 300 type Wall and Table Telephones

Adjustment of Magneto bells

Comparison chart of GPO 300 type telephones

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Last revised: July 22, 2017