Its an old thread but maybe someone still needs info about this.
Its a cold war hugarian gas mask, used by civil defense forces, not military. Also it would be given to every civilian if needed during tho cold war. Its called "75M keretgázálarc" (literally means "75 pattern frame gas mask"- i dont know what frame in this really stands for) as it was introduced in 1975. Often incorrectly referred to as 76M.
The filter canister definitely looks similar to the soviet GP-5 series filters. I'd be weary to actually use this mask as those canisters have been proven to contain small amounts of asbestos fibers.
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