By Universal Microphone Co. The microphone comes with a rubber neckpiece and integral wiring loom with PL-291 2-pin jackplug, neck-clip and elastic neckband (M-199) in a paper envelope. With box of issue and 4 sided illustrated instruction leaflet. 1944 production date. The box is in very good condition. Unissued condition with storage wear only. Many AAF oxygen masks were worn without an integral microphone and these throat-mikes were used instead. They were also used by aircrews wearing headsets (often over 'crusher' caps). Stock code H15710.