Ref: + on the 9mm headstamps
I do not have a reference for German 9mm ammo but the Kent book on 7.9mm ammo has a lot of info about headstamp markings and most seem to apply to the 9mm also. In the book he says, and I quote:
""PLUS" SYMBOL: A satisfactory explanation for this symbol has yet to be determined. It appeared in 1941."
Regards, Leon
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