The lot features a dag knife and beaded sheath attributed to the Sioux Native American Indians of South Dakota. The set shows a double edge dag or stabber knife with three notch cut at the base of the blade with median ridge running down the center, said to have been re-used from a war lance. The blade is hallmarked, “IS” a stamping similar to that of I. Sorby. The dag knife shows a hardwood beaver tail paddle style handle which is accented by brass tacks and is further adorned with a poured bullet lead inlaid pommel end. Similar IS touchmarks have been documents by Hanson, Johnston, Baldwin and others with an example being shown in John Baldwin’s 2008 book, “Indian Knives and Beaded Sheaths of the American Frontier”. The sheath is in typical dag knife pattern constructed of Indian tanned Buffalo Bison hide with geometric glass trade seed beads in a typical Sioux colors and styles of the early period. The beadwork shows a chalk white background with colors of red, cobalt, greasy yellow, light blue. The bottom edge of the sheath shows a strip of red stroud and long hand cut Indian tanned hide fringe and the top shows a braided hide belt strap. Provenance: From the ex-collection of Cyrus Eaton in London, England. Sheath is 16 inches long by 3 1/4 inches wide. The knife is 13 ½ inches long by 2 ½ inches wide.