A bad cast fake skull. All 5/8 are fakes . Also look at the RZM with the weird angle M. The 5/8 and that RZM has been used since at least the 70's including on skull buttons.
You're tired? Wait till you've been here a few years, brother!
there's some markings that doesn't start with M1, It was replaced with a contractnumber.
e.g : 499/41
254/42
and the Wagner eagle, there's is one variation that had the marking M/8
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