US 1968 ABDEREEN PROVING GROUND EXPERIMENTAL “TITANIUM” M1 STEEL HELMET, REF 54/26, 100% OG FINISH, HAS SERIAL NUMBER LIGHTLY ETCHED ON THE INSIDE BACK OF HELMET, NO LINER, BUT TAKES STANDARD M1 LINER TO THE BEST OF MY KNOWLEDGE, C/W OG WEB CHIN STRAP, UNISSUED
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