Katana Abyssal Butterfly Hitatsura Hamon Kairyū Kagechō Koshirae 淵蝶Hitatsura Hamon Full Tang Shinken () Abyssal Butterfly Katana: TangGu () Maru Blade () + TangGu () Kairy Kagech Koshirae () This katana is hand forged (Tezukuri ) from high carbon modern steel () in the Maru zukuri () style. The blade is clay tempered (yaki ire ) to produce a Hitatsura hamon (full temper pattern ) that spreads dynamically across the surface, symbolizing untamed elemental energy. The koshirae features a maru gata tsuba () forged from

Temper Line (Hamon 刃文): Hand-finished decorative Tōran-ba hamon

created through repeated folding and layering

Fittings and Mountings

Blade Characteristics

the Jūji Kikkō motif conveys resilience and permanence

Sageo (Cord 下緒): Deep violet rayon sageo for an elegant and secure presentation

allowing light and shadow to animate the floral forms from every angle

Fuchi-Kashira (縁頭): Made of gilded brass（黄銅鍍金） with nanako-ji（魚子地） background

iron) with a blackened finish (煮黒) and an openwork ocean wave motif (透かし波)

Tsuba (Handguard 鍔): A Mokko-gata (木瓜形) tsuba crafted from brass（真鍮 / Shinchū）

The piece is crafted from shakudō (a refined copper–gold alloy) and finished with a black patina (ni-kuro shiage)

featuring a textured