Hi -- this is most definitely off topic, but I'd rather go here with folks I trust and I suspect one of you knows the answer. I found this scope among my brothers belongings (he passed away a while ago). He was a sniper collector but more US than german. it has the basic layout of the M84 (I dont know us stuff at all!) but looks commercial to me. oddly it has a "USMC" hand stamp, but not sure I buy that. any thoughts? thanks guys as always