Gas Mask King
Norwegian IMA
The Norwegian IMA was made of brown PVC with a large clear panoramic lens. This example was made by Helly Hansen around 1960.
Similar masks in my collection: Norwegian LF-62
Rubber stamp
Model stamp on forehead "IMA"
Rubber stamps
Manufacturer, size, and patent stamps on cheek "3" "H.J.H. NORWAY PAT.ANM."
Rubber stamp
Stamp on exhale valve "6"