U.S. MI-I-I Noncombatant Gas Mask
The U.S. MI-I-I Noncombatant Gas Mask was made from a piece of rubberized fabric stitched together under the chin, with plastic eyepieces stitched in place. An MIV exhale valve sat on the left cheek, and a non-replaceable filter was held on with a thick rubber band. This example was made by Eureka Vacuum Cleaner Company in 1941.
Similar masks in my collection: U.S. MIA2-I-I