Bakelite cased wall telephone,
introduced in 1956 and used by the BPO in C.B. and
Automatic areas on
direct exchange lines. This telephone includes an AC bell ringer.
Offered as an alternative to the table model, Telephone
No. 232 and Telephone No. 332.
This model had no provision for additional push buttons.
It is fixed to the wall, on 4 rubber mounts, by wood screws.
Produced in Black, Chinese Red, Ivory and Jade Green.
Made for the BPO by British Ericsson, their models:-
Telephone No. 333CB - Model
Telephone No. 333L - Model
Telephone No. 333F - Model
Telephone Includes (1955):-
1 x Bell No. 59A, Unmounted.
1 x Bell-gong No. 2.
1 x Bell-gong No. 2A Nickeled.
1 x Coil, Induction No. 27.
1 x Condenser, M.C., No. 97.
1 x Cord, Instrument, No. 5/28E, 5" (for Dials, Auto., only).
1 x Dial, Automatic, S.S., No. 12LA & FA ... or Dummy, No. 3 (Colour).
1 x Part No. 1/SCA/17 (Colour).
1 x Telephone No. 164 (Colour).
Circuit diagram - N433.
Drawing No. 90696.
Diagram for Button labels - N620.
History, Technical and General
Information on 300 type telephones
Development of the Bakelite Wall
How to wire your Telephone No. 333 to make it work on Plug and
How to restore Bakelite
Keys for use in 300 type Wall and Table
Adjustment of Magneto bells
Comparison chart of GPO 300 type