R.L. Wilson in "The Book of Colt Firearms" lists the total production of .64 caliber Colt Model 1855 revolving rifles at 25 or less, all of them military rifles, and also indicates that they were numbered within the same range as the .56 caliber rifles. They make up around 1/4 of a percent of the total production of the Model 1855 Military Rifles. The U.S. government purchased over 4,000 of Colt revolving rifles and carbines during the Civil War. Some were issued to the Berdan Sharpshooters. It is possible these large caliber revolving rifles were designed for the U.S. Navy given the Navy's use of other large caliber rifles like the Plymouth rifles during the era. This rifle has a block/blade front sight, notch and two-leaf rear sight graduated for 100, 300 and 500 yards, "COL. COLT HARTFORD CT. U.S.A." on the top strap, the 1857 patent marking on the left side of the frame, the 1850 patent date on a cylinder flute, "K" on the left side of the trigger guard, "74" on the bottom of the frame and trigger guard, long forend with brass cap and two barrel bands, 5-shot fluted cylinder, cleaning rod compartment in the stock (empty), and leather sling. "GDM" (George D. Moller) collection initials marked at the toe of the stock. Includes a "US" marked socket bayonet with leather scabbard and hanger. Provenance: The George Moller Collection