Stores Ref. 10A/11994. Black painted alloy microphone, often referred to as the "1941" pattern although actually introduced in October 1940. Some paint chipping/rubbing on exposed edges and minor shape distortion at the edges - easily reshaped if necessary. Air Ministry and King's crown markings. A reasonably good used example. These microphones were used in conjunction with the type D cloth oxygen masks. Stock code O8444.