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Originally Posted by Erik_james
Yeah your probably right, Russians wernt that advanced back then. Its really hard to say what time period it is actually from. I'm guessing the 17 05 53 is most likely the manufacture date (even though the numbers arnt in a straight line across from each other, that would still be a valid date.)
But I really cant give you a definate answer.
Erik
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Yea, I don’t think it’s the manufacture date as it’s split up, and the K-53 I’m pretty sure stands for something else.
I put a message into a “Gas Mask collectors club” I found on the web, they seem to know what they are talking about so hopefully one of them will be able to solve this mystery.