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The M/31 was a pre-war Finnish civil defense gasmask. Finland made rubber mask covered with brown-green canvas. Olive colored metal canister with straps. This mask was used mainly by Civil guards and Lotta Svärd organisations.

The mask is made of red, canvas-covered rubber. It has 5 point head harness and two glass eyepieces. The mask was very simply designed, with a fixed filter and no tissot system or exhale valve.

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