Manufactured in the first year of production, 1873, and inspected by Ordnance Sub-Inspector Orville W. Ainsworth (OWA). It subsequently was refurbished by Colt in the mid-1890's. This revolver has the desirable early production features which include the "script" barrel address with slanted crosses at either end of the marking, "1871/1872", "two-date/two-line" patent marking on the left side of the frame, small "U.S." property mark on the left side of the frame, small cylinder bolt stops, early ejector housing with barrel boss and small "A" (Ainsworth) sub-inspection mark visible on the trigger guard, back strap and in two locations on the side of the cylinder. The lower left side of the one-piece walnut grip is stamped with the script initials "OWA" surrounded by a rectangle. "P" proof marks are stamped on the underside of the barrel in front of the frame on the side of the cylinder. The serial number, "803" is stamped on the bottom of the frame, the trigger guard, the factory replacement back strap in smaller numbers as typical of factory overhaul, side of the cylinder, underside of the barrel beneath the ejector housing and underside of the barrel ahead of the frame and behind the "P" proof mark. An "H" factory sub-inspector mark is on the rear face of cylinder. The inside of the loading gate is stamped with the assembly number "2623". The revolver has the early "bullseye" style ejector rod and replacement cavalry style hammer with bordered elongated knurling on the spur. The barrel, ejector housing, cylinder, trigger guard and back strap have a high polish blue finish. The frame, loading gate and hammer are color casehardened. The one-piece walnut grip is oil-finished. Documented Ainsworth sub-inspected Cavalry Single Action revolvers between serial number 266 and 882 were issued to the 1st, 5th, 6th and 8th Cavalry regiments. Nearly all of the Ainsworth sub-inspected Cavalry Single Actions saw frontier service and were subsequently overhauled as this example.