That is one amazing revolver (MAYBE??? See "EDIT", below...). If the finish is original, which it appears to be, you have one of the best ones out there!
However, one thing to check is for a date stamp on the frame under the stocks. If it is present, it indicates a factory refinish. For example, if you see "12.29", it means it was back to Smith & Wesson in Dec 1929 for some sort of work, such as a refinish. However, no matter which way you cut it, you own one stunning example!
Did you find it in France?
EDIT: I'm confused. Original photograph appeared to show a pristine blued gun. Other photographs depict a not so pristine nickel gun. All final verdicts and hypotheses withdrawn until that matter is resolved.