Ok, I'll take a stab at it. I would say maybe, you will see rework guns that have just a S/42 mark denoting that they were Mauser made replacement parts. These will usually not have a number added to match the rest of the gun. Your 1921 could have been reworked and had the date removed and re-stamped. If it was a new production then it was upgraded at some time, but I still don't think that a field armory or regular armorer would bother to stamp the number on a replacement part. Just my .02
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