Katana Veiled Aegis CPM-3V Blade Genkō Koshirae 玄鋼

Vacuum Heat Treated Full Tang Shinken (真剣) | Veiled Aegis Katana: TangGu (湯谷) CPM-3V Maru Blade (丸造) + TangGu (湯谷) Genkō Koshirae (玄鋼拵)

This katana is mounted in an uchigatana-style koshirae (打刀拵) and emphasizes restrained craftsmanship and functional clarity. The blade is produced in Maru-zukuri (丸造) monosteel construction from CPM-3V high-performance powder steel, vacuum heat treated to achieve a controlled balance of hardness and exceptional toughness. As a modern monosteel blade, it displays no visible hada (鍛肌なし). The blade features a hand-polished decorative Tōran-ba hamon, created through traditional polishing techniques for visual reference and classical aesthetics. The saya (鞘) is finished in Kanshitsu Black Ishime lacquer (乾漆黒石目塗), presenting a textured, stone-like surface with a subdued, understated appearance. The koiguchi, kurigata, and kojiri are reinforced with water buffalo horn. A Japanese-made sageo, available in multiple color options, completes the scabbard. The tsuka (柄) is wrapped in black ito over genuine ray skin in an aged off-white tone, reinforced throughout with hishigami (菱紙) for structural consistency. The menuki (目貫) are crafted from yellow brass, formed in a bamboo-style profile. The fuchi and kashira (縁頭) are blackened brass fittings with a uniform dark finish. The tsuba (鍔) is a custom-profile openwork iron guard, finished with a black sandblasted surface treatment, maintaining a subdued, non-reflective appearance consistent with the overall mounting philosophy.

TangGu (湯谷) Maru Blade

This blade is crafted from CPM-3V high-performance powder steel using a monosteel Maru-zukuri (丸造) construction.

Blade Forging Details

• Blade Name: TangGu CPM-3V Maru Blade (丸造)
• Forging Method: Maru-zukuri (丸造) monosteel construction, formed from a single piece of CPM-3V powder steel. Heat treatment is performed in a Nadcap-certified vacuum heat-treating facility, ensuring precise temperature control, structural consistency, and optimal performance.
• Materials: CPM-3V powder steel, selected for its outstanding impact toughness, fine carbide distribution, and reliability under demanding use conditions.
• Purpose: Suitable for Kenjutsu and Tameshigiri (test cutting) practice, collection, and display. 

Blade Specifications

• Blade Length (Nagasa刃長): Approx 70 cm
• Handle Length (Tsuka 柄長): Approx. 26 cm
• Width at Base (Motohaba 元幅): Approx. 30 mm
• Thickness at Base (Motokasane 元重): Approx. 6.5 mm
• Width at Tip (Sakihaba 先幅): Approx. 20 mm
• Thickness at Tip (Sakikasane先重): Approx. 4 mm
• Kissaki Length (Tip 切先長): Approx. 29 mm
• Mekugi-ana (Peg Hole 目釘穴): 1

Blade Characteristics

• Shape: Shinogi-zukuri (ridged blade 鎬造), Iori-mune (flat ridged spine 庵棟), Chū-kissaki (Medium-sized tip 中切先)

• Forging Pattern (Hada 鍛肌): None (鍛肌なし) — forged from CPM-3V high-performance powder steel.
• Temper Line (Hamon 刃文): Hand-finished decorative Tōran-ba hamon, created through traditional polishing techniques for visual reference and classical aesthetics.

Special Features and Workmanship

Hi (Groove) Engraving

• Type: Hi-Nashi (樋なし)
• Processing Range: None (No bohi) – Solid blade for added weight and strength

Polishing Work

• TangGu Polishing Levels:
  • Highest-grade shaping polish 最上・成形研磨 
  • Superior rough polish 最上・下研ぎ 
  • Detailed final polish 最上・仕上げ研ぎ 

Fittings and Mountings

Blade Fittings

• Tsuba (Handguard 鍔): Custom-profile openwork iron tsuba, finished with a black sandblasted surface treatment.
• Fuchi-Kashira (縁頭): Blackened brass fittings with a uniform dark finish.
• Menuki (目貫): Yellow brass menuki in a bamboo-form profile.
• Habaki (鎺): Handcrafted purple-copper Nekogaki (cat-scratch / 猫掻) pattern habaki.
• Samegawa (Ray Skin 柄鮫): Genuine ray skin in an aged off-white tone.
• Handle Wrapping (柄巻): Black cotton tsuka-ito, tightly wrapped in hineri-maki (捻巻) style.

Saya and Accessories

• Saya (Scabbard 鞘): Traditional-style design reinforced with water buffalo horn at the koiguchi (mouth), kojiri (end), and kurigata (cord knob).
• Saya Lacquer (鞘塗): Finished in Kanshitsu Black Ishime lacquer (乾漆黒石目塗), featuring a textured, stone-like surface that reflects a refined, subdued traditional aesthetic.
• Sageo (Cord 下緒): Japanese-made sageo available in multiple colors

Measurements

• Blade Weight: Approx. 0.65 kg
• Sword Weight (without Saya): Approx. 1.0 kg
• Total Weight: Approx. 1.3 kg
• Overall Length: Approx. 103 mm