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
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
Keys for use in 300 type Wall and Table Telephones
How to restore Bakelite