Katana in Shirasaya(NBTHK Hozon Paper) Signature : Bizen Osafune Toshimitsu. Shitoku 2 nen 8 gatsu Hi (August 1385) middle Koto: Cyujyo saku ranking:Bizen school. (We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular ...