Signature: Signed on the blade: Kiyomitsu of Osafune, Bizen province 1533; on the sword guard: Hirokuni.
Inscription: Inscribed on the tang of the blade, on the obverse: 備州長船清光作 (Bishū Osafune Kiyomitsu Saku) (Made by Kiyomitsu, Osafune, Bizen Province [present-day Okayama Prefecture]); on the reverse: 天文二年八月日 (Tenbun ni-nen hachi-gatsu hi) (Second year of Tenbun , eighth month, day).
Ex. coll.: George C. Stone, New York, no. 2591.George Cameron Stone, New York (until d. November 18, 1935; his bequest to MMA).