This is an original Colt Model 1861 Navy Revolver fitted with a COLT factory installed percussion-to-cartridge conversion. These were converted during the mid to late 1870s from returns of various military and civilian 1861 Navy revolvers. This gun is a 5-digit serial number (33XXX) of the original 1861 Navy series (Civil War era); the conversion is post-Civil War from 1870s. It is a center-fire (centered firing pin on hammer). These were converted from .36 caliber percussion to .38 caliber cartridge; all of these revolvers - conversion or otherwise - retain the original .36 caliber markings. Both .36 and .38 calibers are low pressure black-powder loads and not intended for modern smokeless powder/loads. The earliest conversions - 2000 of them were done by COLT. THIS ONE IS MARKED 511, INDICATING IT WAS THE 511 CONVERSION - were produced at the Colt factory from existing parts (with a conversion kit added).. All parts are matching serial numbered.. The cylinder has the 511 number indicating the conversion number.. The pistol is in overall very good condition.. On the Barrel is ADDRESS COL. SAMl COLT NEW-YORK U.S.AMERICA.. On receiver is PAT. JULY 25, 1871 and PAT. JULY 2, 1872.. Please ask for more pictures or information.. Will ship Internationally.. Shipping in the U.S.A. would be $10.00 plus insurance.. PRICE $ 2.995.00