Katana in Shirasaya with koshirea(NTHK estimation Paper) Signature : Mumei (Den Kaga Iyo Daijyou Katsukuni) (We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saki)This sword Den Kaga Iyo Daijyo KAtsukuni belongs to ...