This Model 6A variation of the Colt Model 1855 was manufactured in 1866 and is particularly scarce in that it features factory vine style scroll engraving and a carved grip with raised relief golden eagle with a snake in its beak resting on a cactus based on the version of the Coat of Arms of Mexico used for most of the 19th century. Colt was no doubt particularly interested in cultivating the Mexican market following the Civil War given the tightening of the American gun market following the production and demand boom during the war. The matching serial number is on bottom of the barrel, cylinder, and butt, and the grip is numbered with the last three digits of the serial number in Roman numerals. An "E" for engraved is marked by the main serial number on the butt indicating the engraving is factory. It consists of the late vine scroll patterns and extends to the breech section of the barrel. The barrel also has a brass cone front sight and "ADDRESS COL. COLT/NEW-YORK U.S.A." The cylinder has the stagecoach hold up scene. It comes in a 19th century custom rosewood case with brass corner protectors and lid plaque inscribed "Amori Benson." The English style fitted interior contains several lead balls and conical bullets, a blued Colt patent bullet mold, single sided eagle pattern pocket powder flask, a rod, and an Eley cap tin. No detailed provenance is available to specifically indicate who Benson was or his connection with the revolver. The most well-documented man with this name from the period is physician, judge, and local politician Dr. Amori Benson (1799-1876) from Vermont (see "History of Bennington County, Vt" from 1899). Amori Benson Jr., the former's son, was born in 1823 and served as a policeman in Cambridge, Massachusetts, before moving to Maine.