This is a U.S. Springfield Model 1873 Trapdoor chambered in 45-70 government.  The rifle 32.5" round barrel with trapdoor single shot breech marked "U.S. Model 1873."  The side plate of the receiver area is marked U.S. Springfield with the US Patriotic Eagle holding a shield and arrows.  This is a pre-1898 firearm and classified as an antique.  I have personally fired this rifle, it is a blast and in great working condition.  New manufacture 45-70 government ammo will come with the rifle.