Rai Kunitoshi, ‘Blade for a Dagger (Tantō)’, ca. 1315–1316, The Metropolitan Museum of Art

L. 13 5/8 in. (34.6 cm); L. of cutting edge 9 3/8 in. (23.8 cm); W. of blade at hilt 15/16 in. (2.4 cm); Wt. 7 oz. (185 g)
http://www.metmuseum.org/art/collection/search/24948

About Rai Kunitoshi