In addition to the Echizen Shigetaka attribution, the blade has been attributed to Soshu Fusamune and Horikawa Kunihiro.
Yamazaki Ichiga (Ichiga V, circa 1750-75) was the son of Ichiga IV and a pupil of Goto Jujo (Mitsutada), 12th main line Goto master. See Moslé (1932) no. 1390.
Inshi was a student of Yoshioka Inji; he also signed Inju. He worked in Edo and specialized in fuchi kashira and menuki.