The legally correct serial number for your pistol is the one on the frame, 16643.
If you encounter cycling problems when shooting this, it may relate to the recoil spring, which was originally installed for use with a 7.65mm / .30 Luger upper with a longer barrel.
Both the frame and the toggle train in your pistol are from the Swiss gun. I can't remember if the longer frame affects the position of the receiver on the frame, or if this ends up changing the timing when the gun is fired and cycled.
Have you shot it yet?
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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