If it was assembled in Germany, then it would need German proof marks
I still believe the 1350 is the pressure rating as that is a common number seen on these guns and is typically required before barrel weight to be stamped on them - but I have also been wrong before - weighing the barrels will prove or disprove that aspect
I am still wondering about the barrel with the supposed 12 gauge bore size - I can't imagine someone boring out a 16 to 12 - too confusing and the possibility of an OOPS too great
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