Yagyu Shinkage Ryu Sankou 1
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Item No - S-YSS#1
Yagyu Shinkage Ryu is a famous sword school. Unfortunately this Ryu has lost its shurikenjutsu but the densho still show drawings of shuriken in them including this one.
Thanks to Mark Lithgow a member of Yagyu Shinkage Ryu for providing information on this shuriken.