I have a muzzleloading pistol that i believe to be an american arms derringer. It is a 32/32 over-under swivel barrel, no sights on the gun, frame is silver or nickel, the handles have been replaced with brass but i believe originally they were mother of pearl or ivory. There are no distinguishing trademarks or numbers anywhere on the peice. If anyone has any information about this gun or the original Americans Arms Company, please reply!!!! Thanks