This is a very interesting and unique Colt Model 1851 Navy. Most of the components on this revolver have no serial numbers aside from "6514" or "0514" on the wedge and "5599" in the back strap mortise of the grip. The "No Serial Number" '51 Navy revolvers are discussed in Swayze's "'51 Colt Navies" on page 217 where the author notes: "Although a few of these guns are known to exist, the reason for the lack of serial numbers is - to the Author's knowledge- unknown." One possible theory is that this revolver and others were made up near the end of production from remaining parts on hand. Some of the parts are in the white, unfinished, and an "&" is marked on the right side of the trigger guard, a mark believed to relate to factory reworked guns. The barrel has a post front sight and the one-line New York address. The frame has no markings. The cylinder has the standard roll scene and patent marking. A spare reproduction cylinder numbered "20928" and marked "B528" on the rear is also included (no nipples).