Rare complete original Early Model 1873 with deep clear “Model 1873 eagle head U.S.” markings. The firing pin is spring loaded and the cam is the first model. It is in fine overall condition. It will fit and function perfect in any Springfield 45-70 Trapdoor Carbine, Rifle or Cadet that has a receiver serial number less than 90,000. These complete early blocks with all the correct parts are difficult to locate.