For legal purposes, use the serial number (including the suffix) stamped on the frame in front of and above the trigger guard.
I also have a Luger that was fitted from two pistols. The top half (receiver, cannon and toggle train) from one gun and the bottom half (frame) from another. I also have a P.38 that was assembled this way with arsenal marks.
The fit of these parts on a Luger was rather precision, as was the fit of the trigger plate. I suspect that this was not done casually without proper tools and experience.
Handguns were certainly damaged during combat and other usage. Remember that the Germans wasted nothing.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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