A few weeks ago, I have purchased an M1 Steel Pot Helmet and M1 Liner from two different sellers, the liner I know for a fact came from the Vietnam war as the original owner had given it to the seller. The shell I am not too sure. I know for a fact it isn't WWII, as the stamp number is over 1300. The stamp number is 8582. An estimate of the date this helmet was stamped would be appreciated. Thanks!
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