By Universal Microphone Co. These microphones come with a rubber neckpiece and integral wiring loom with PL-291 2-pin jackplug. The box also contains the neck-clip and elastic neckband (M-199) in a sealed paper envelope. With box of issue and 4-sided illustrated instruction leaflet. The box is in good order bar loss to one corner. The throatmicrophone is in unissued condition with storage wear only. Many AAF oxygen masks were worn without an integral microphone and these throatmicrophones were used instead. They were also used by aircrews wearing headsets, often over 'crusher' caps. Stock code H15711.