U.S. Army M3A1 Diaphragm Gas Mask

The U.S. Army M3A1 Diaphragm Gas Mask was an updated version of the U.S. M3 Diaphragm Gas Mask, with blue/green plastic parts instead of metal.  This example was made by General Tire & Rubber in 1943.

PATENT

 

Similar masks in my collection:  U.S. Army M3 Diaphragm, U.S. NORBA Type A-3, U.S. ND Mk IV

Rubber stamp
Rubber stamp

Manufacturer, date, and lot stamps on chin "LOT C1 2-43 GENERAL E42 R92" "M3 C5"

Stamp
Stamp

Stamp on head strap

Filter
Filter

Filter stamps top view "LOT-C766-10 CWS J&J A"