Katana Obsidian Wave Oroshigane Kobuse Blade Kuronami Koshirae 黑浪Folded Oroshigane Steel Shinken () Obsidian Wave Katana: TangGu () Oroshigane () Kobuse Blade () + TangGu () Kuronami Koshirae () This uchigatana () has a blade forged from in house refined Oroshigane () steel in Kobuse zukuri () construction, with a hardened outer steel shell around a softer core the same method used in tamahagane blades to achieve both strength and resilience. Traditional folding produces a mixed Mokume hada and Masame hada ()

Samegawa (Ray Skin 柄鮫): Hon-samegawa（本鮫皮 / genuine ray skin）with kofū shiage（古風仕上げ / antique finish)

achieving comparable performance and structure while allowing the smith to refine the steel’s properties by hand

The tsuba (鍔) is an iron guard with an openwork plum tree and resting bird motif (Ume ni Shukuchō Sukashi / 梅樹宿鳥透鐔)

kojiri (鞘尻)

bringing the design to life from every viewing angle

carved in relief with bamboo and flying bird motifs (竹鳥図)

Handle Wrapping (柄巻): Brown silk (or cotton) tsuka-ito with hishigami（菱紙）

irregular temper line characterized by alternating rounded peaks

Processing Range: None (No bohi) – Solid blade for added weight and strength

The combination of full-surface wave carving and shimmering gold highlights gives this piece both practical function as a sword fitting and exceptional presence as a standalone collectible artwork

Crafted from iron and meticulously hand-finished

Forging Pattern (Hada 鍛肌): Mokume-hada mixed with Masame-hada（杢目肌・柾目肌交じり）— a composite pattern showing wood-grain swirls with straight grain elements