Sword and Engraving by Gassan Sadatoshi : r/SWORDS
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A Gassan katana | Signed Naniwa ju Gassan Unryushi Sadakazu kore o seitan [forged by Gassan Unryushi Sadakazu, a resident of Osaka] and impressed mark Sada | Meiji period, dated Meiji nijuninen
Katana: Gassan Sadakazu (with Saber Koshirae) | Japanese Sword Online Museum
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Japanese Sword - Wakizashi - Outstanding Ningen Kokuho National Living Treasure Gassan Sadaichi
Ko-Gassan katana in Edo mounts and NBTHK Hozon - Nihonto Art