Sorry if I acted offended earlier, it's been a tiring day and I may have been a bit short. Maybe this will help explain how I reached my conclusion , first clue if you notice the address on the top of the barrel, it says -Address Samuel Colt New York City- correct address for time. Serial number , which dated it to 1863 is also located in many places on the pistol. On the bottom of the frame, barrel, trigger guard, cylinder. Also last 4 didgets were on small things like wedge, loading lever ect. Modern replicas do not have all of those numbers. Another clue was the serial number is in a correct 19th century font. Look at modern stamping and also look at older known originals. You can see the difference. Also if you look at the left side of the frame you can see the words Colts patten in two lines on the gun. This is also correct font and location. If it was govt issue there should be a us cartouche stamped under the words. This pistol also had larger oval trigger guard. Colt varied the trigger guard some from year to year and this is what is called the 4 model I believe. Also there should be a 36cal designation on the trigger guard. Not saying this could not all be faked as colt reproduced this pistol in the 70's and they had a lot of the same markings. They were imported parts and assembled in America so they didn't carry many of the Italian proof the new one carry. All this being said the biggest clue was the fact that this pistol had deep cut rifling with 6 lands and grooves and carried a gain twist. The other things can be easily faked and made to look old. The rifling is not so easily done. You mentioned documentation, this pistol had none but a call to Colt for a Colt archieve letter would be a wise choice. A letter world probably cost a couple hundred bucks but it would give some piece of mind. Well I guess that is all I got so hope you all enjoy.