table microtelephone (with DC trembler bell) for use in CBS No's 1, 2, 3 and
Magneto areas and on long lines in CB and Auto areas on extension plans.
Also used on Private Wires.
Bakelite cased telephone with provision for 3 buttons.
Mark 1 - has a receiver, Inset No. 1L in the handset.
Mark 2 - has a receiver, Inset No. 2P in the handset.
Mark 2A - has a receiver, Inset No. 2P in the handset and switch bracket and
plungers of an improved design.
Also found on diagram SA 4091.
Circuit diagram N492.
Supplied to the BPO by Ericsson, their Model N8444.
Circuit diagram - N492.
Diagram for the Button labels - N620.
History, Technical and General Information on 300 type telephones
General fault finding on your phone
How to restore Bakelite
Dismantling the Handset
Dismantling your Telephone No. 312
Keys for use in 300 type Wall and Table Telephones
Labels that fit in the sliding tray
Comparison chart of GPO 300 type telephones