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British Bathtub Key - circa WWII Used in Lancaster bombers. Sealed case kept spark from igniting fuel fumes during flight
This key was produced by the PMG (Postmaster Generals Department in Australia circa 1941 for use in the field telegraphy/telephony set. It subsequently was used in fixed radios and 'spy' sets for agents of the time due to it's small size. (Thanks to Alex Berkuta vk2xtx, for his great info on this key !)