Katana in Shirasaya with Koshirae(12th NBTHK Juyo paper: reissued) Signature : Mumei (Den Gojo Kanenaga) Sayagaki: by Dr.Kanzan. Gojo Kanenaga, Osuriage Mumei, blade length is 62.72cm written by Dr. Kanzan in winter 1962. (We divide 4 sections for each sword ...