https://www.aoijapan.com/katana%EF%BC%9A-horimono-ikkanshi-technique-ryuouji-minamoto-sadatsugu-kao-a-lucky-day-in-january-1955-carving-by-the-same-artist-nbthk-tokubetsu-hozon-token/
Katana: Horimono Ikkanshi technique Ryuouji Minamoto Sadatsugu (kao) (1955) (NBTHK Tokubetsu Hozon...