By Shure Brothers, Chicago. The microphone comes with a rubber neckpiece and integral wiring loom with PL-291 2-pin jackplug. Also fitted with an elastic neckband (M-199). The throatmicrophone is in excellent condition although the strap is a little worn with some loss of elasticty. 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 H21244.