Kunitsuna (国綱), Kenchō (建長, 1249-1256), Yamashiro – „Kunitsuna“ (国綱), Awataguchi school, first name „Tōroku“ (藤六), sixth son of Awataguchi Kuniie (国家), honorary title „Sakon Shōgen“ (左近将監), he was active from about Kenpō (建保, 1213-1219) to Kōchō (弘長, 1261-1264). The sword was once a heirloom of the Nishitakatsuji (西⾼辻) family that served on a hereditary basis as shintō priests the Dazaifu Tenmangū on Kyūshū. Kinai (畿内), saijō-saku.
Designated as Kokuhō (National Treasure) in 12th month of the 1931 year.