Chōgi (Nagayoshi) (長義), Kan ́ō (観應, 1350-1352) Bizen, Osafune; name at birth Tōzaemon (藤左衛門); he was the son of Osafune Mitsunaga (長船光長) who was active around Ōchō (應長, 1311-1312) era; regarding of his workmanship, Chōgi has not much in common with Osafune main line smiths because due to the strong Sōshū-den influence (Chōgi was, like Osafune Kanemitsu, one of the most representative Sōden-Bizen smiths) his swords does not look like Bizen-mono at a glance. San ́indō (山陰道), saijō-saku.
Designated as Tokubetsu Jūyō Tōken at the 21st tokubetsu-jūyō-shinsa held on the 22d of April 2010.
Provenance: Family Heirloom of Count Itō Miyoji (伊東巳代治, May 7, 1857 – February 19, 1934).
