Manufactured in 1874, the second year of production, this revolver features the standard blade front and notch rear sights. The top of the barrel is marked with the early slant letter "+COLT'S PT. F. A. MFG. Co. HARTFORD, CT. U.S.A+." The two-line, two patent date marking is on the left side of the frame followed by "U.S." The bottom of the barrel is marked with a small "P" and "A" just ahead of the cylinder pin. An "A" is on the cylinder, top of the back strap and just below the serial number on the trigger guard. There is a "C" marked on the back of the top strap in the hammer well, and the loading gate is assembly numbered "728". The ejector rod head is the "bulls eye" or donut style with the hole in the center. The matching serial number is marked under the ejector rod on the barrel, (partial "2210"), frame, trigger guard, back strap and cylinder (partial "2210"). It is fitted with a smooth one piece walnut grip with a boxed "OWA" cartouche on the left side. Orville W. Ainsworth was the first principal sub-inspector assigned to Colt by the War Department. Collectors commonly refer to this variation as an "Indian scout" Colt Cavalry.