Signa - Telegraph Collection

Two Air Ministry Keys.

At the left: not quite the typical Morse key, but used by airplanes, activating lights in the outside, during radio silence.

Marked “Type B Ref. No. 5C/372 Switch Box Identification.”.

At the right a large key Type D Ref. No. 1 OF/7373.

It has very large contacts, with a self cleaning action while used.