10 minutes ago I would have agreed with Muzzlesmoke and said REPLICA. Now I'm
not so sure. Figured the stamped numbers/letters were just screaming replica,
but then I found this.
Look HERE: THE GRISWOLD & GUNNISON REVOLVER
It's just barely possible that it is indeed an original Griswold and Gunnison 1862 revolver.
Does it have any makers name on it anywhere? Pietta, Armi San Marco--anything?
Does it have any proof marks on it anywhere? Bottom of the barrel? Cylinder?
If not---don't do ANYTHING to it. Don't clean it, don't polish it, nothing more than
wiping it down with a bit of oil on a rag.
There are probably more replica Griswolds out there than real ones, but if you do
happen to have a real Griswold and Gunnison, and especially if you can prove the
5th Georgia Cavalry connection, it has some real value.