Manufactured in 1874. O.W. Ainsworth's desirable "A" inspector mark is found on the trigger guard, barrel, and back strap. A "P" proof is found on the cylinder and barrel. The barrel has the one-line Hartford address, and the frame has the two-line patent dates marking followed by partially obliterated "US." The ejector rod has a bullseye head. The matching full serial number is found on the frame, trigger guard, back strap, cylinder, and barrel. Ainsworth physically inspected SAA revolvers recorded in the serial number range 200 through 14343. This was the first major block of U.S. Cavalry revolvers. This revolver falls into the serial range of Cavalry Models that were issued to the 6th Cavalry.