U.S. Army M4-10A1-6 Lightweight Service Gas Mask

The U.S. Army M4-10A1-6 Lightweight Service Gas Mask was nearly identical to the M3-10A1-6, with a minor adjustment made to the placement of the lower head straps.  It was produced in both black and gray (green) rubber.  This example was made by Goodyear in 1942.

PATENT

Rubber stamps
Rubber stamps

Manufacturer and date stamps on chin "C5-2-402" "12 41 LOT P273-1 GOODYEAR 3 42" "171"

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Filter model stamp top view "CWS US M10A1" "632 31"

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Filter lot stamp top view "LOT JJ-48 4-1"