Factory cased Colt Model 1855 Sidehammer Pocket Revolver manufactured in 1863. This Model 5A revolver features a .31 caliber, 4-1/2 inch barrel, full fluted, five shot cylinder and round loading lever with navy type latch. The top of the barrel is roll-stamped: "ADDRESS COL. COLT/NEW-YORK U.S.A." in two lines. "PATENTED SEPT. 10th 1850" is roll-stamped in one cylinder flute, and "31 CAL" is stamped on the right side of the frame behind the recoil shield. The serial number is stamped on the underside of the barrel and the bottom of the back strap. The revolver has the Colt high polish commercial blue finish on the barrel, cylinder and frame with fire blue trigger and color casehardened loading lever, hammer and cylinder pin. The one-piece walnut grip has a varnished piano finish. The revolver is complete with an American style Colt mahogany case with six compartments lined with deep purple or brown velvet. The case contains: (1) 100 count tin of Eley percussion caps with green label, (2) L-shaped screw-driver, (3) steel pick with turned walnut handle, (4) un-marked brown lacquer pocket-pistol powder flask with gold-plated top and adjustable charger, (5) blued straight leg double cavity iron bullet mold marked "COLT'S/PATENT" in two lines across the top of the sprue cutter and "31 PKT" on the side of the right block, (6) assorted .31 caliber lead balls and (7) key. Designed by Elisha K. Root, the Model 1855 Sidehammer revolvers were the only Colt percussion revolvers with a solid frame. Approximately 40,000 Model 1855 Sidehammer revolvers were manufactured between 1855 and 1870.