Bakelite wall telephone for use in CB & AUTO areas on PBX extensions, systems that require recall facilities and certain extension plans.

This telephone has provision for one button in the case moulding. The pictures show a standard Telephone No. 333.

Circuit diagram N431.

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

History, Technical and General Information on 300 type telephones

Collectors information

Click here for Button labels  - Web users - CD users

Keys for use in 300 type Wall and Table Telephones

How to restore Bakelite

Comparison chart of GPO 300 type telephones

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Last revised: January 06, 2018