It would not have been terribly hard for someone with access to an arsenal full of parts to come up with matching numbers back then. It appears that the entire lower frame is from one pistol, (Mauser) and the upper receiver and toggle train from another, (DWM, or Erfurt with a DWM toggle train). The Barrel, as mentioned, is a Mauser made arsenal replacement barrel. There is no chamber date that I can see, so the upper was a commercial offering in .30 Cal. Luger and was converted to 9mm via the barrel replacement.
Although the numbers match, this does detract significantly from the pistol's collector value.
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