TELEPHONE No. 321
This Bakelite cased wall telephone was introduced in 1955 and used by the BPO on shared service lines. It is fitted with an AC bell ringer.
The telephone has provision for three press buttons and is used with Adaptors Shared Service No. 1 & 2.
Telephone No. 321F supplied by British Ericsson as their
Telephone No. 321CB supplied by British Ericsson as their
Diagram for telephone circuit - N421.
Diagram for Button labels - N620.
Case and Adapter Shared-Service No. 1 removed
Case removed exposing Adapter Shared-Service No. 1 (centre)
Last revised: June 06, 2020