Stores reference 10A/11994. Black painted alloy microphone, often referred to as the '1941' pattern although it was actually introduced in October 1940. Also known as the 'type 21', but this is the reference allocated to it when fitted to a wiring loom. The casing of this example is somewhat distorted and paint chipped but alloy is quite easy to reshape. Air Ministry and King's crown markings. Complete with inner rubber band but this is hard/perished. With remanants of the original wiring loom. The type 20 microphone was mainly used in conjunction with the type D cloth oxygen mask. A fair used example. Stock code H8215.