Combined wall handset telephone used by the BPO in CB and Auto areas.

This telephone has a magneto bell and provision in the Bakelite case moulding for three buttons.

Used on extension plans that require an additional gravity springset and more than one press button.

Circuit diagram N429.

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: March 18, 2018