This is a fabulous, large dag knife sheath and dag knife from the Blackfeet Piegan of Northern Montana of the 19th-century from an ex-museum collection. The sheath exhibits Indian tanned hide over thick buffalo / bison parfleche rawhide that is sinew sewn and shows a classic Blackfeet / Blackfoot dag knife pattern with tapering triangle sheath with diamond like lower tab. The front is covered in glass trade seed beads showing a classic Blackfeet dag knife beadwork pattern. The beads are sinew sewn. This is paired with a mid-19th-century dag knife which features a forged iron blade in dag form showing a double edge blade with thicker center median secured to a solid hardwood one piece grip with poured lead pewter. The dag knife is covered in panels of solid copper plaque / placards which are hand etched showing a eight-point star and roach spreader like designs accompanied by old solid brass square shank trade tacks across both sides and the outside edge. The blade has heavy coloring, copper has dark tarnish as do the tacks and the wood a nice worn patina. The sheath shows a river like section in the center with fancy beaded outer edge. The sheath shows a yellow ocher / ochre coloring on the hide with some wear on the backside. There is some slight bead loss and some preserved work. Provenance: From an ex-private museum collection in Montana. The sheath and beaver back style of dag are very similar to other documented examples such as the Blackfeet Crow’s Foot (1836-1890) Dag Knife and Beaded Sheath (with the same pattern) which sold in 2013 at Cowan’s for $$65,000 and the sheath is incredibly similar to the Large Blackfoot Beaded Buffalo Hide sheath and double-edge dag knife circa 1870 from the C.P. Carberry Glacier Park collection and sold in 2016 at Skinners-Bonhams for $70,725. Sheath and knife together measures 21-inches long. Sheath by itself is 16 3/8-inches long by 4-inches wide. Dag knife is 14.5-inches long by 2.5-inches wide.