Colt 1871-72 Open Top, #2897
Early production (about 7000 total made), .44 RF caliber with 7-26-99 provenance letter to one of the great Colt collections of all time, Albert Watson. This has been one of the jewels of my collection since that time and is one of the top 6 condition blue Colt Open Tops known, probably. 
The gun is about 80-90% overall, with the blue thinning just at the muzzle and front of cylinder, the case hardening is about 75% and the walnut grips wonderful original finish with just one scratch on right side. Investment grade, very difficult to improve, the only one I have seen better was $125,000! Might could get factory letter, absolutely the best at $55,000.