This revolver was completed at Colt's short lived factory in London in 1853, the first year of production for the London '49 Pockets. The barrel has a cone front sight, "{ADDRESS COL. COLT/LONDON}" marked on top, and London proof and view marks on the left ahead of the wedge. The five-shot cylinder also has London proof and view marks. The frame has "COLTS/PATENT" on the left. Matching serial numbers are marked on the wedge, arbor, cylinder, loading lever, barrel, frame, trigger guard, and back strap. The back strap is somewhat coarsely inscribed "Lt Col Dunlop" and the case lid escutcheon is neatly inscribed "Lt. Col. Dunlop/R.A." The case also contains an L-shaped combination tool, Colt ball/bullet mold, Eley Bros. cap tin, bag shaped James Dixon & Sons powder flask, and some bullets and spare nipples. The identity of Lieutenant Colonel Dunlop is not clear. He may be William Wallace Dunlop of the Madras Infantry promoted from lieutenant colonel to colonel in the Indian Army on in 1861.