A bit more information would help. Remove the grips, and get a couple good pictures
of the grip frame - one on each side. Also, look in the extractor rod housing for anything
that looks like a B or an N. On the grip straps, we are looking for either of those two
letters, as well as a <> diamond symbol, or a date, like 6.1922. These questions are
all about trying to determine if the nickel finish is original.
Also measure the length of the barrel from the front face of the cylinder to the muzzle.
Its probably a 5" barrel. 4 7/8 is possible for a 5".
There is some surface damage, but these guns are scarce and they do have a large
following. I don't follow their pricing, but lots of others do.
Mike Priwer