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.
Manufacturer, date, and lot stamps on chin "LOT C1 2-43 GENERAL E42 R92" "M3 C5"
Stamp on head strap
Filter stamps top view "LOT-C766-10 CWS J&J A"