Manufactured in 1863 (Model 5). The barrel is marked "ADDRESS COL. COLT/NEW YORK U.S.A." "PATENTED SEPT. 10th 1850" is in one cylinder flute. "31 CAL." is on the right side of the frame behind the capping cut-out. London "Crown/V" and "Crown/GP" proof and inspection marks are stamped on the left side of the frame and each cylinder chamber. The serial number "7148L" is stamped on the butt, and "7148" is stamped on the underside of the barrel. The "L" indicates a gun produced for Colt's London Agency. The British oak case has brass reinforcing screws, round brass inlay on the lid and six compartments with a dark green baize lining. A Colt instruction label is glued to the inside of the lid. The case contains a tin of Eley percussion caps for Colt's belt and pocket pistols, steel cleaning rod with turned maple handle, five round packet of Hazard's combustible cartridges for Colt's or Whitney's .31 caliber revolving pocket pistols, L-shaped combination screwdriver for Model 1855 pistols, iron .31 caliber bullet mold marked "COLT'S PATENT/II" on the sprue cutter, bag-shaped Dixon powder flask with adjustable charger and lanyard ring marked "COLTS POCKET FLASK" on the lid, "Dixon" marked pewter oil bottle, key and .31 caliber cartridge and assorted .31 caliber round balls and conical bullets.

Exceptionally fine overall, retains 85% plus bright original high polish blue. The high polish blue finish has some scattered flaking on the barrel muzzle and sides and on the leading edges of the cylinder. The sides of the frame show some scattered light scratches and handling marks. The hammer, loading lever and cylinder pin retain nearly all of the vivid case colors. Most of the fire blue finish remains on the trigger and screw heads. The cylinder pin has some light tool marks. The one-piece walnut grip excellent and retains almost all of the piano finish. The action is tight and fully functional. The British factory case is very fine to excellent. The varnished exterior shows only light handling wear. The baize lining is clean, unfaded and remains excellent. The instruction label has some scattered stains from contact with the revolver but remains fine. This is an outstanding example of a rare British cased London proofed Colt Model 1855 Sidehammer Pocket Revolver with all of the correct accessories furnished with London Colt revolvers.