This is a very nice example of a gas mask used by the US military starting in the 1930s and throughout World War 2. This is a model M1A2. The top of the mask is stamped US; U. This stands for United States and universal size. The mask is a stockinet covered rubber. This example appears to be new old stock. The rubber hose is present. At the end of the hose is where a filter canister would be attached. Edgewood Arsenal made many of these until 1944, when they were declared obsolete.
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