U.S. Army M1 Dust Respirator

The U.S. Army M1 Dust Respirator consisted of a rudimentary filter pad and a button valve.  This example was made by Willson in 1942.  Here it has been paired with Sun/Wind/Dust Goggles made in 1974.

Similar masks in my collection:  U.S. Navy Type 4 Comfo Respirator