I removed the grips and the only thing I found was another serial number on the grip frame. It matches all the other serial numbers. I took out my good magnifying glass under strong light and looked for any markings on the gun. there are absolutely none. No sign of any manufacturer's or proof marks being removed. The parts used in this gun never were marked in any way.
Any former US Patent Firearms Company employees out there? Come clean with us, did you ever build any revolvers as prototypes our of unmarked parts?
Why would someone build a revolver out of totally unmarked parts, then etch the cylinder to match the originals but say it was US Patent instead of Colt Patent, then antique the gun, then build a wooden case for it, and then print PHONY owner's manuals?
BTW, when I took off the grips and looked at the wood underneath, it is BEAUTIFUL work! Wonderful wood work, good wood!