Robertson’s Colt Single Action Army revolver, serial no. 164326, with numbers matching on the frame and backstrap, .45 Colt cal, 4″ barrel. Barrel is also stamped “RSW,” with an 1875 patent stamp on frame, and has replacement Colt stag grips. Gun is mechanically sound and tight. Revolver comes with a nice leather holster which is signed in black felt tip by Robertson. In fine condition, with some scattered light pitting. This transfers as a modern firearm. RR Auction COA.