hey marty, are you looking for one with the two eye holes, or a full shield style gas mask (aka, swat style).
I know it's far away, but there's an antique shop in new west (YA I GO TO ANTIQUE STORES) that had both styles, authentic real deal gas masks, for about $30 if i recall correctly. The full shield one was marked 'SWAT' and the normal one was marked 'VIETNAM'. (I bought the korean gas mask and cut it up to make steampunk goggles for my costume). Don't know if you want real or even spend any money, but i don't even know if army surplus stores will have them that cheap.
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