Very nice! A great looking gun!
I have a Belgium copy SAA in the same caliber that belonged to my great uncle. Based on the proof mark it has, it was probably made post 1890. He was a traveling rep. for International Harvester and traveled all over the country. I'm guessing he bought the pistol sometime between 1890 and 1900. It is no where near as nice as your Colt. Other than the proofs on mine and the same caliber marking - "32 W.C.F." there are no other markings on it. I inherited it after he passed away - just wish I had known he had it while he was still alive so I could have found out the history behind it. Mine isn't a nice Colt like yours but even though it's a cheap imitation, I treasure it.
If a pair of '51 Navies were good enough for Billy Hickok, then a single Navy on my right hip is good enough for me . . . besides . . . I'm probably only half as good as he was anyways. Hiram's Rangers Badge #63