[lugerholsterrepair]

Could the crowned G have anything to do with the reworking?

No..The Crown G is an Imperial marking done many years before the re work. It is just as likely there is no re work mark. Some were some were not. The fact of the changed out and re numbered parts tell us it was reworked and my guess is by Mauser. If it were Simson they had a habit of marking pistols with an Eagle 6 in various and sundry places.

Chip..In reviewing your photo's I just noticed something! There is what I suspect is a Simson Eagle 6 on your magazine bottom. Can you look closely at this Eagle and tell if there is a 6 beneath it? There has to be because this IS a Simson Eagle.
Also look for this same Eagle on the back flat portion of the spine of the magazine at the bottom. Ed Tinker, or Dwight Gruber would know the answer to this..the Authors of Simpson Lugers, Ed, and Police Lugers. Dwight and Ed. I don't know if the Simson Eagle would be present but please have a look.

OH..And no marking under the grips will tell us anything..mostly inspectors markings there but will be unknowns.