I am hoping that you can help me. I have a very old revolver that I need identified. . I am attaching some pictures for you to look at. Maybe you can figure this out. It is an American Arms CO Boston, MA U.S. top latch, 6shot, 32 S&W long, nickel plated, grips are rubber. There is no record of this gun being produced except for a law suit filed by S&W because of patent infringement involving the star auto ejection system. This gun as far as I can tell from my research so far, was made about 1867. It was introduced after the 32 short Top Latch 5 shot with the manual ring for unloading. I hope this info helps. I look forward to hearing from you.