up for sale is a WW2 German gas mask. This appears to have never been issued or not really used. There are plenty of makers marks on this inside and outside of the mask as well as the canister having an eagle stamp.

this does have the extra lenses under the cap and is marked Hagenuk 1938

The canvas and leather of this mask is surprisingly soft and supple which makes me believe this canister hadn't been opened that many times and the lenses are very clear (sorry about the glare)