Chances are from what I can see is that somebody pieced together a conversion of what used to be an old Colt Blackpowder. The New York address is typical. Colt felt that his arms would have a better chance of selling with the New York address instead of Hartford. The barrel is either from a Colt 1861 Navy, or 1862 Pocket Police that has been cut down. From the front sight I would guess the 1861 Navy. The bottom rear of the frame and grip frame were probably part of the original Colt, but the brass frame and it's cylinder, I have no idea.