Italian Maschera Antigas I.A.C. M.31
The Italian Maschera Antigas I.A.C. M.31 was made of smooth dark brown rubber. This example features a speech diaphragm/exhale valve incorporated into the hose, and was made by Industria Articoli Caoutchouc around 1933.
Maschera Antigas = "Gas Mask"
Industria Articoli Caoutchouc = "Rubber Articles Industry"
Manufacturer and model stamp on cheek "M.33 II (I.A.C. logo)"
Stamp on cheek "226651"
Stamps on ends of hose
Filter stamps top view
Filter date stamp bottom view "7-1936"
Filter stamp side view "T. 35"