Only an estimated 2,700 Second Model Dragoons revolvers were manufactured around 1850 and 1851 compared to 7,000 of the First Model Dragoons and 10,500 Third Model Dragoons. They are thus by far the scarcest of the primary Colt Dragoon revolvers. This example was manufactured in 1850, has a non-matching barrel, "COLTS/PATENT/U.S." marked frame. The U.S. Contract Colt Dragoon revolvers were used primarily by the First and Second Dragoon Regiments and the U.S. Regiment of Mounted Riflemen from 1849 until the Civil War.