I have what I believe to be a Colt Single Action Army revolver. It matches photographs posted on the internet. The barrel is 5 1/2", 11" overall, 6 shot. The only markings are 45 cal, ser. 78643, patents:Sept 19, 1871, Jul 2-72, Jul 19-75. I don't understand why there is no Colt name stamped anywhere. Is this unusual? Any ideas on how I can make a positive identification?
Bob
Bob