Introduced in 1937 this combined table handset telephone (with magneto bell) was used in both CB & Automatic areas on extension plans.

This telephone had a tray for the subscribers personal directory but as from June 1940 the tray was not fitted and instead the telephone was supplied with a Tray, Dummy, D62099 (a blank plate).  This was probably a war time cost saving, as in late 1947 the tray was re-introduced.

Has provision in the case for three additional keys/press 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 with a switch hook bracket and plungers of an improved design.

Telephone included:-
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. 10 ... or Dummy, No.3 (Colour).
1 x Part No. 3/SCA/17 (Colour)
1 x Telephone No. 164 (Colour)
1 x Tray, D 62076 (Colour) or D1/62833 (Colour) or 1 x Tray, dummy, D 62099, Black.

To be requisitioned separately as required:-
1 x Block, Terminal No. 20/ . . (Colour)
1 x Key No. 303A or 304A.
1 x Label No. 160.
1 x Label No. 252, Black.
1 x Part No. 1/SPL/325 .

Used as follows:-

Model System Dial Colour
Telephone No. 328B Brighton BA Black, Chinese Red; Ivory; Jade Green
Telephone No. 328CB CB manual Dummy, No. 3 Black, Chinese Red; Ivory; Jade Green
Telephone No. 328F Non-director FA Black, Chinese Red; Ivory; Jade Green
Telephone No. 328L Director LA Black, Chinese Red; Ivory; Jade Green
Telephone No. 328S Siemens, Southampton FS Black, Chinese Red; Ivory; Jade Green

British Ericsson provided the GPO with Telephone No's 328F,  328L and 328CB.

Circuit diagram - N428.

Diagram for Button labels - N620.

Drawing - 63022

Additional good quality pictures

History, Technical and General Information on 300 type telephones

Collectors information

General fault finding on your phone

How to restore Bakelite

Dismantling the Handset

Dismantling your Telephone No. 328

How to wire your Telephone No. 328 to make it work on Plug and Socket

Keys for use in 300 type Wall and Table Telephones

Lamp Fittings

Labels that fit in the sliding tray

Adjustment of Magneto bells

Comparison chart of GPO 300 type telephones


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Last revised: November 20, 2021