Hi Alan-san,
Thank you.
I know the chin strap is different than original, but it might be some kind of non offical replacement, there were field repairer for specialized in repairing soldier's uniforms and other damaged gears. The strap on my helmet seems been there for a long time, the some damages, (folded sweat stains), the black stitching also act as a stopper too. The original straps are not hard to get, so that doesn't bother me, at all.
Cheers!
Taka
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