Pederson 3 inch rear sight. Has base with 2.26 inch center holes Should fit original or replica 1874 sharps and 1885 hi walls Winchester/browning. New owner may need to get the proper screws it comes with two what I believe to be 4mm which will fit Pedersoli. C Sharps ,Shiloh and original should be 10/28 size for 1874. This sight will let reach out to 800 yards or more depending on your loads. $150.00