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Is there a difference between an O-katana and just a katana? - Quora
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O-Katana – Cloudhammer Steelworks
Tamahagane O - Katana - Samurai Swords
O Katana for Sale - TrueKatana
Hand Forged Japanese Samurai Katana Sword O-Kissaki 1095 Carbon Steel Clay Tempered - COOLKATANA
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