TELEPHONE No. 331
Bakelite wall telephone for use in CB & Automatic 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 shows a standard Telephone No. 333, with no button.
Diagram for telephone circuit - N431.
Diagram for Button labels - N620.
Last revised: April 23, 2022