Katana in Shirasaya(NBTHK Tokubetsu Hozon Paper) Signature : Hizen Koku Ju Omi Daijo Fujiwara Tadahiro Shinto: Jyo-Jyo saku ranking: Wazamono cutting test ranking: Hizen province. (We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and ...