The six-round .36-caliber Navy revolver was much lighter than the contemporary
Colt Dragoon Revolvers developed from the .44
Walker Colt revolvers of 1847, which, given their size and weight, were generally carried in saddle holsters. It was an enlarged version of the .31-caliber
Colt Pocket Percussion Revolvers, that evolved from the earlier
Baby Dragoon, and, like them, was a mechanically improved and simplified descendant of the
1836 Paterson revolver. As the factory designation implied, the Navy revolver was suitably sized for carrying in a belt holster. It became very popular in North America at the time of
Western expansion. Colt's aggressive promotions distributed the Navy and his other revolvers across Europe, Asia, and Africa. The cylinder of this revolver is engraved with a scene of the victory of the Second
Texas Navy at the
Battle of Campeche on May 16, 1843. The Texas Navy had purchased the earlier
Colt Paterson Revolver, but this was Colt's first major success in the gun trade; the naval theme of the engraved cylinder of the Colt 1851 Navy revolver was Colt's gesture of appreciation. The engraving was provided by
Waterman Ormsby. Despite the "Navy" designation, the revolver was chiefly purchased by civilians and military land forces. The .36-caliber () round lead ball weighs 80 grains and, at a velocity of per second, is comparable to the modern
.380 pistol cartridge in power. Loads consist of loose powder and ball or bullet, metallic foil cartridges (early), and combustible paper cartridges (Civil War era), all combinations being ignited by a fulminate
percussion cap applied to the nipples at the rear of the chambers. A very small number of Navy revolvers were produced in .34 caliber, and are so marked. Another rarity in the 1851 Navy production is the .40-caliber model, only 5 were made in 1858 for testing by the U.S. Navy Bureau of Ordnance. Identifying features of the First Model Squareback (Serial 1 to ~1250) are the wedge screw beneath the wedge and the wedge notch on top of the cylinder pin (Photo Serial No. 2). Sighting consists of a tapered brass cone front sight pressed into the muzzle end of the top barrel flat with a notch in the top of the hammer, as with most Colt percussion revolvers. In spite of the relative crudity of the sighting arrangement, these original revolvers are generally quite accurate. However, the same cannot be always said for the reproductions. ==Colt 1851 Navy conversions==