Bakelite cased wall telephone, introduced in 1956 and used by the BPO in C.B. and Automatic exchange areas on direct exchange lines.  The C.B. variant was fitted with a Dial, Automatic, Dummy No. 3.

This telephone includes an AC bell ringer.

Offered as an alternative to the table models, Telephone No. 232 and Telephone No. 332.

All components and the case are mounted on a plate.  This plate is fixed to the wall, by means of 4 rubber mounts, using wood screws.

The case was fixed by a single screw next to the Handset cord entry.  The case had a strap that fixed to the back plate allowing the case to hang during maintenance work.

To remove the case, release the lower fixing screw adjacent t to the handset cord entry point.  Pull the bottom of the case outwards about one inch.  Lift the case upwards to release the top fixings.

This model had no provision for any push buttons keys.  If push button keys were required then a Telephone No. 321 would be supplied.

Produced in the colours; Black, Chinese Red, Ivory and Jade Green.

Made for the BPO by British Ericsson, their models:-
Telephone No. 333CB - Model N1432A1.
Telephone No. 333L - Model N1086A2.
Telephone No. 333F - Model N1086A1.

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, Automatic only).
1 x Dial, Automatic S.S., No. 12LA & FA ... or Dummy No. 3 (Colour).
1 x Part No. 2/DCA/89 (Colour).
1 x Telephone No. 164 (Colour).

Circuit diagram - N433.

Drawing No. 90696.

How to wire your Telephone No. 333 to make it work on Plug and Socket

Dismantling the Handset

History, Technical and General Information on 300 type telephones

Development of the Bakelite Wall Telephone

Collectors information

How to restore Bakelite

Keys for use in 300 type Wall and Table Telephones

Adjustment of Magneto bells

Comparison chart of GPO 300 type telephones

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Last revised: April 23, 2022