Patterned after an original rear sight found on a very early Hawken halfstock rifle, owned by the famous mountain man of Taos, Mariano Modena. Angular flats decorate the base of this semi-buckhorn sight. The base is .500" long by .580" wide. Dovetail .050" deep. Height from the bottom of the dovetail to the top of the sight notch is 0.29".