Any help would be greatly appreciated on this. Long story short, given to me by My passed Uncle who lived in Las Cruces. I don't know why, but I am having a hard time figuring out what this one is. Definitely not my area of expertise. Marked as it says in the title. No other markings except what is in pictures. It has three file or cut marks on the crane, which my Uncle said was from three cattle rustlers killed. Buy the gun, not the story... I know. This was given to me by an old cowboy (Uncle) and that is what he told me. I am not looking to sell, so just any info would be appreciated. I looked up the serial # on Colt's website, and it says among many other possibilities, 1877 Thunderer. That doesn't match up with other pictures I have looked at. What say the experts?6e6318c95c08225520160403081831826_thumb.jpg20160403_201145.jpg20160403_201235.jpg20160403_201303.jpg