USGI Avon M50 gas mask CBRN NBC sz LARGE Millitary

This mask is a military issue M50 gas mask made by Avon in a size LARGE. It comes with cvc hood, head strap and carry case no filters. I did see it is missing a grill cover in the front out side of mask, it doesn't effect the preformace of the mask but should be able to be bought on line or taken from another doner mask. Also drink pipe is not there, again mask works without it.