These "New Model Pocket Pistols" were patented by Samuel Colt and are the sole Colt percussion handguns manufactured with solid frames with top straps over the cylinders. They have been nicknamed "Root Revolvers" by collectors after Colt's superintendent: Elisha K. Root. They were manufactured between 1855 and around 1870. The .28 caliber version was dropped in 1861, the year this revolver was manufactured, as the .31 caliber version took its place. This particular revolver is a special order nickel plated late Model 3 variation, and it remains in exceptional condition. The barrel has a small cone front sight and the two-line patent and Hartford address with the manicule motif at the beginning. This motif was eliminated on the later Model 1855 revolvers. The top strap groove serves as the rear sight. The fluted cylinder has the patent marking between the chambers, and the arbor pin has "MAY 4th 1858". Matching serial numbers are on the bottom of the barrel, back of the cylinder, and the butt. The case contains a cleaning rod, L-shaped combination tool, Eley Bros. cap tin, small double sided eagle powder flask, and a Colt patent dual cavity bullet mold.