As used by the National telephone Company, GPO and all leading Government Departments. Provided with
"Hunningscone-Deckert" microphone, double pole ring receiver, ebonite handle with battery switch and 4 conductor
flexible cord.
Price in 1904 was £1.4.6
K 24
As K 23 but fitted with a 4 pin plug.
Taken from the G.E.C. Illustrated Telephone Catalogue 9th edition (1904)