Manufactured under a July of 1861 contract, with delivery of 10,000 rifles completed in 1864. The Plymouth Rifle was manufactured on the recommendation of Navy ordnance officer John A. Dahlgren and was based on the French Model 1849 "Chasseurs de Vincennes" percussion rifle. It features a .69 caliber rifled barrel with bayonet lug on the right side, long range rear ladder sight graduated to 1,000 yards, trigger guard with spur finger grip and ramrod with large cylindrical tip pierced with a small hole. "1864" dated tail of the lock and top breech of the barrel along with a Navy anchor, with "V/P/eagle head" proofs marked on the upper left quarter of the breech, and the serial number "9024" is marked on the barrel tang. The lock is marked with a federal eagle above "U.S." ahead of the hammer and "WHITNEY-VILLE" at the front. "F.C.W" (Frank C. Warner) inspection initials marked on the left barrel flat, and a boxed script "FCW" inspection cartouche stamped on the left stock flat. "US" marked buttplate tang.