Most of the U.S. inspected New Model Army revolvers were manufactured in 1863-1865, but the model remained in production until 1875. They were the second most widely issued revolvers of the Civil War after Colt's Model 1860 Army, and continued to be used in the West during the settlement of the West and the post-Civil War Indian Wars. It has standard markings and features, small inspection markings, a "GP" cartouche on the left grip, and matching serial numbers on the barrel, rear face of the cylinder, grip frame, trigger guard, and grips.