Avon Full Face Respirator M50 Gas Mask Protection Medium. The item “Avon Full Face Respirator M50 Gas Mask Protection Medium” is in sale since Monday, October 28, 2019. This item is in the category “Collectibles\Militaria\Surplus\Personal, Field Gear\Gas Masks”. The seller is “diaism” and is located in Bethany, Connecticut. This item can be shipped to United States.