Manufactured in 1874. O.W. Ainsworth's desirable "A" inspector mark is found on the barrel, trigger guard, back strap and cylinder. A "P" proof is found on the barrel and cylinder. It has the one-line Hartford barrel address, two-line patent dates and "U.S." frame markings, correct bullseye ejector rod head and matching serial numbers on the frame, trigger guard, back strap, cylinder, and barrel. The loading gate has the assembly number "294." The left side of the grip has traces of a script letter cartouche. Based on serial data complied by Kopec and Fenn, this revolver falls into the 6517-7527 serial number range of Cavalry Models issued to the 3rd and 7th Cavalries. This group of Cavalries was shipped from the Springfield Armory in May 1874. Included is a U.S. Model 1885 leather flap holster featuring the Lanz Owen & Co. of Chicago marking on the belt loop. 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.