L. 33 1/8 in. (84.2 cm); L. of blade 29 13/16 in. (75.8 cm); L. of cutting edge 23 7/16 in. (59.6 cm); D. of curvature 5/8 (1.6 cm)
Gift of Brayton Ives and W. T. Walters, 1891
Not on view
Inscription: Inscribed on the tang of the blade, on the obverse: 備前國住左近大夫祐定 (Bizen no Kuni jū Sakon Dayū Sukesada) (Sakon-dayū Sukesada, residing in Bizen Province [present-day Okayama Prefecture]); on the reverse: 永禄三年二月日 (Eiroku san-nen ni-gatsu hi) (Third year of Eiroku , second month, day); on the sword guard (tsuba): 一柳友善（花押） (Hitotsuyanagi Tomoyoshi (kaō)).
Brayton C. Ives, New York (until 1891; his sale, American Art Galleries, New York, March 9, 1891 and following days, to Walters); W. T. Walters, New York (1891; his gift to MMA).