.44 Rimfire. 7.5" barrel length. SN: 2794. Nickel plated refinish to all parts including small parts, one piece walnut grips, and mounting rear notch and front blade sights mounted on the barrel. Single-action loading gate cartridge revolver mounting Army size steel gripstraps and an externally mounted loading gate spring. The left frame is marked - -PAT. JULY. 25. 1871.-/- -PAT. JULY. 2. 1872.-, and the barrel displays the single line address marking -ADDRESS COL. SAML COLT NEW-YORK U.S. AMERICA-. Further markings include reapplied Ormsby roll engraving on the cylinder. The serial numbers match on the gripstraps, cylinder, frame, and barrel. No serial visible on the arbor pin with its sharp lines indicating it is a replacement. The loading gate assembly number has been obliterated. Wedge pin is not numbered. The barrel address mark appears to have been restruck. Though outwardly resembling the earlier Richards and Richards-Mason pattern of cartridge converted revolvers, the Model 1871-72 Open Top revolver was manufactured from new production parts, making it Colt's first purpose built full size cartridge revolver (the smaller Cloverleaf and Open Top Pocket revolvers both entered production earlier). Chambered in the popular .44 Henry Rimfire cartridge, the revolver offered buyers an excellent companion to the repeating rifles offered by Winchester in the same instant. However, thanks to the development of the famed Single Action Army type, the Colt Open Top's production run lasted for just under one and a half years from February of 1872 to June of 1873 with less than 7,000 manufactured in total.