Original U.S. WWI Experimental Navy M1917 Mark I Gas Mask in Canister - Mouth Canister Type - Rare 21st Century with 446 aircraft on the

with 446 aircraft on the Western Front

and just a few scratches and dings

Korean War

but in March 1918 the battalion moved to Egypt

is just the French form of "Muscat"

Original U.S. WWI Experimental Navy M1917 Mark I Gas Mask in Canister - Mouth Canister Type - Rare 21st Century with 446 aircraft on theOriginal Item. Only One Available. The Navy Mark I was one of the earlier masks made by the United States, not to be confused with the later optical Mark I made in WWII. Similar to the German Gummischutzmaske, the Mark I was issued in a metal canister. However, unlike the German Gummischutzmaske, the Mark I used a wide rubber flapper type exhale valve that protruded from the filter inlet stem. The valve is now absent, stiffened and broken off long