Bakelite handset wall telephone with DC trembler bell for use on extension plans in CBS No's 1, 2, 3 and Magneto exchange areas and on long lines in C.B. and Automatic exchange areas.

Fitted with a Magneto bell and has provision for three buttons.

Circuit diagram - N495.

Diagram for the Button labels  - N620.

History, Technical and General Information on 300 type telephones

Development of the Bakelite Wall Telephone

Collectors information

Keys for use in 300 type Wall and Table Telephones

How to restore Bakelite

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Last revised: February 07, 2023