From card: "Case carved. The blade of Japanese manufacture; the carved case made by the Ainos. Illus. in USNM AR, 1890, page 457, fig. 76".
Illus. Fig. 29.19 p. 217 of Fitzhugh, William W., and Chisato O. Dubreuil. 1999. Ainu: spirit of a northern people. [Washington, D.C.]: Arctic Studies Center, National Museum of Natural History, Smithsonian Institution in association with University of Washington Press. Identified there as man's sheath knife (makiri),which was worn hanging from the belt with a thong.