This is the second type Springfield 45-70 rear carbine rear sight. It has a C marking on the base to designate Carbine. The ladder has 12 elevations on the ladder for Carbine. This sight was originally used with the 1873 dated breech block. It will fit and function perfect on any Springfield 45-70 Trapdoor.
Excellent Condition with clear marking. The ladder flips up easily and the elevation slide works great This is an original Springfield Model 1877 45-70 Trapdoor rear sight. It was designed for the carbine. It will also fit all Models including 1873, 1877, 1878, 1879, 1884 Carbines.