Bakelite telephone with 3 press buttons. Used with extension switching facilities.
N22528 is fitted with an AC bell.
The telephone is similar to a GPO 300 type, but the body is fixed to a plinth, made of wood, that has a toggle type switch or indicator fitted in the front below the dummy tray.
The words Plan 6 has been seen on the base of the N22589.
Last revised: May 03, 2020