Katana in Shirasaya with Koshirae(26th NBTHK Juyo paper) Signature : Mumei(Den-Nagamori) Middle koto:Jyo saku ranking:Bizen (We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku) This Mumei Nagamori belongs to Saijyo(top) saku ranking. ...