sentences:  Colt 1851 Navy Revolver
  
  The Colt Revolving Belt Pistol or Navy Pistol Sometimes erroneously referred to as "of Naval or Navy Caliber" (Naval is heavy gun and Navy Size Caliber was termed later for another Colt model), is a 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 Revolving Belt, but the designation "Navy" quickly took over.