Bidspirit auction | WWI US Gas Mask Respirator

WWI US Gas Mask Respirator With Still Soft Mask - Gas mask appears to have had the interior layer that becomes hardened with time. The mask is in good condition but for the black flapping valve. The hose is flat and stiff at certain points. Has Instruction record book that is not filled out. Has inside metal spring. Both lenses are perfectly clear. This mask can be displayed on a head or mannequin.