Manufactured at Colt's London factory in 1855. Colt's Model 1851 Navy revolver proved to be very popular in the U.K. initially following the Great Exhibition in London in 1851. Features the large oval steel trigger guard, steel back strap, wide cylinder nipple cut-outs, bordered knurling on the hammer spur, and round head frame and trigger guard screws that are typical of Colt London Navy revolvers. The top of the barrel is roll-stamped "-ADDRESS. COL: COLT, LONDON.-" and London "Crown/GP" and "Crown/V" proof and inspection marks are stamped on the left side of the barrel lug and alternating between each nipple on the cylinder. All matching visible serial numbers.