The Germans did the same thing when they upgraded the WWI-era Gewehr 98 rifles to WWII standards. I have a 1916 Gewehr 98 that was reissued for WWII use and it's marked "S/42" on the right side of the receiver and the rear sight parts. I would assume they did the same thing to pre-WWII pistols that were intended to be used by the Wehrmacht.
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