I have for sale three M9 / M9A1 gasmasks they are still hermetically sealed in their original metal "spam cans". The can contains the gas mask, a filter, and a gasmask carrier bag. Face piece is "M" (Medium). Canister position is "L" (Left side). It is fully intact with attached opening-key, The cans are in good condition with only a few small dings/dents and a few small scratches. It was originally marked as an M9 gasmask but it was painted over and M9A1 was re-stenciled onto the can by the military, to streamline logistics. There's no difference between the M9 and M9A1 except for the carrier bag it came with. I want $45 each, or trade for? I also have additional sealed filters for $6 each or $4 each if you buy a gasmask.