Mask, Gas, Optical, M1A1
Genuine WWII US M6 carrier in OD green canvas, marked Army Lightweight Optical Mask, which contains an M1A1 Optical Gas Mask (dated 1952) connected to a M10 canister by a tube.
Special mask intended for personnel operating sighting or fire-direction equipment. The is mask fitted with optical glass visors and a diaphragm.
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