It depends who rebuilt the gun. There were plenty of blank part available to armorers at that time which they could fit, install, number and then re-blue.
Regarding the photos, you say here are "more". Is there a total of 3 posted or did I miss some?
The extractor seems to be ill-fitting, suggesting a replacement part, but that is about all that I can tell you from the last 2 photos.
dju
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