This 1862 Colt Police has always puzzled me, not a mark on it which made me think it was a defarb until I got it home and disassembled it. It has all flat head screws except the charging handle. The rifeling in the barrel is old style, not repro so at least that much of the gun is old but there is no address. Under the best magnifiers I've got I can't pick up a trace of a mark in either Colt or Italian positions.