.455 Eley caliber, 5″ barrel with British proofs.  Retaining of the  original blued finish, the left side of the slide stamped Patented Apr.20.1897.Sept.9.1902/Dec.19.1905.Feb.14.1911.Aug.19.1913/Colt’s Pt.F.A.Mfg.Co./Hartford Ct. U.S.A., the right side with Colt Automatic/Calibre .455, the right side of the frame stamped Government Model, the butt with panel chequered walnut grips, two-tone magazine, the base-plate with lanyard-ring and stamped Cal. 455/Eley