The Colt Revolving Belt Pistol or Navy Pistol, sometimes erroneously referred to as "Colt Revolving Belt Pistol of Naval Caliber" or "of Navy Caliber," is a .36 caliber, six-round cap and ball revolver that was designed by Samuel Colt between 1847 and 1850. Colt first referred to this Revolver as the Ranger Size model, and then the Revolving Belt, but the designation "Navy" quickly took over.