U.S. Navy Civilian NC-1 Gas Mask
The U.S. Navy Civilian NC-1 Gas Mask was made of black rubber covered in gray stockinette. It featured a single plastic panoramic lense, dual cheek filters, and spearhead exhale valve. This example was made in 1942.
Similar masks in my collection: U.S. ND Mk V
Stamp and writing on forehead "(?)" "C-3211"
Stamp on snout "US (Navy anchor)"
Date stamp on flutter valve "11" "4-42"