Katana Obsidian Wave Oroshigane Kobuse Blade Kuronami Koshirae 黑浪 Fashi The design is hand-engraved with

The design is hand-engraved with flowing stream lines and blooming cherry blossoms

are engraved with wave patterns（波文）

This Katana (打刀) features a blade forged from in-house refined Oroshigane (卸し金) steel in Kobuse-zukuri (甲伏造) construction — a hardened outer jacket surrounding a softer core

The natural grain of the hada harmonizes with the classical hamon

The Mokume fuchi-kashira set is crafted from white copper and features a finely carved wood-grain texture that flows continuously across both the fuchi and kashira

Katana Obsidian Wave Oroshigane Kobuse Blade Kuronami Koshirae 黑浪 Fashi The design is hand-engraved withFolded 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 ()