If at all possible please provide lots of good quality pics, especially of all of the factory and post factory markings/stamps.

If the rebound slide pin is truly flat on the left side frame, as it appears to be, then it would be hard to argue against a refinish. Softening of any of the factory applied markings or bluing present where the factory would have left things in the white are also indicators of a refinish.

When I say "tasteful" refinish I mean the refinisher was very mindful about not overly washing out markings or rounding of squared edges. Unfortunately there will usually be evidence of a refinish performed if one knows what to look for closely enough. I have seen a few over the years that were very very well done and could possibly fool even a few more experienced collectors.

You might also remove the stocks and look for a factory rework numeric date code stamped on the left side grip frame. It's a stretch but it would be nice to eliminate any possible factory refinish/caliber change work being performed. I think we would have already heard about a star, diamond, or other external factory rework symbols by now from you if that were the case.