Correction:
Thought again about the 12.4 mm indication. Well, according to German Proof Law the calibre of the bore was measured and indicated, not the calibre (gauge) of the chamber. So, assuming the bore has (had) a diameter of 12.4 mm, it could be, the original shot calibre was in fact 13 mm, like stated in the 1906 Sauer catalog. I don’t know, what the diameter of the shell for this odd 13 mm shot shell was, but it could (!) correspond with a 24 gauge.
Also, I was wrong regarding the crown/B proof marking (that happens, when you rely just on memory). No, it’s not for rifles only, but is indicating a single proof. That’s all. Nevertheless, there should be present more proofs. At least, I’d expect crown/S (S = Schrot = shot).
BTW: if you’d tell us the serial number, I could make a statement when the gun was made.
Regards
Martin
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