A friend has a colt revolver that we are trying to identify. On it is the following: Colt 41 D.A. patent 3426 September 19th 1871 to January 19th 1875. The serial number is 123425. I called Colt and was told that it should have a model name on it also. I don't remember seeing a name on it and called the owner and he said he didn't see one either. I am going back over to see him tomorrow and take a closer look. I looked on the internet and the only thing I have found that looks like it to me is a model called the Thunderer. Any of you fellows have an idea what it might be? I will check it out again as I said but I thought some of you may have an idea with the description I have given.