This is an original Springfield Model 1877 with  NO Steps on the base, 45-70 Trapdoor rear sight. Excellent Condition with deep clear marking. The base is marked with an R for Rifle. The ladder has 11 elevations on the ladder for rifle. The ladder flips up easily and the elevation slide works great This is an original Springfield SECOND TYPE Model 1877 45-70 Trapdoor rear sight. It was designed for the rifle or cadet. It will also fit all Models including 1873, 1878, 1879, 1884, 1888 Springfield Rifles and Cadets. Use mounting screws (ORI-332) for this sight