First, it appears the revolver was returned to the factory for some kind of service in 5/26 (at least it looks like 26 to me), by the stamping on the left grip frame. Not necessarily re-bluing, however - could be any repair work. The star on the butt means the same thing.

Second, it would likely be from the 1917-1920 period, as I see no S&W logos on the frame or sideplate. Grips are from much later, post-1969. SN does not indicate military, so probably from post-WWI, 1919-20. Also, no "Made in USA" stamp, therefore, definitely pre-1923.

As a guess, I doubt it has been re-blued. I don't see the typical Diamond and B or S or rectangle with R S stampings which would indicate a factory refinish. Others with more knowledge than I will probably comment.