This is a copy of the old sights that Freund invented in the 1870's and 80's. This one is designed for Shiloh Sharps Dovetails. The front sight has a contrasting color on the front edge to be seen easily. The rear sight has a diamond shape opening below the sight notch for better visibility during low light hours and to keep from canting the rifle. The staff can be flipped up for longer distances. These sights are shown in "Freund & Brothers - Gunmakers to the West" by Pablo Balentine, Item #FBPG in our book section.