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Home / Collections / Antique Katana / Tanto - Mumei(No Signature) - NBTHK Hozon Certificate(Kunihisa) - Shirasaya - Ubu Nakago - Koto Era - Tokyo 284454

Tanto - Mumei(No Signature) - NBTHK Hozon Certificate(Kunihisa) - Shirasaya - Ubu Nakago - Koto Era - Tokyo 284454

¥450,000

This dagger is a unique piece that received completely different appraisals from two different institutions.

First, in October 2000, Tokuno Kazuo, renowned in sword appraisal and founder of the United Association of Japanese Sword Research, authenticated this piece as made by Rai Hidetugu, who was active during the Joji era of the Nanboku-cho period, and his appraisal certificate is attached. Hidetugu is said to be the son of Kunihide, a disciple of the first Rai Kunitsugu, but information about him is scarce, making him an enigmatic swordsmith.

On the other hand, in August 2025, the Society for the Preservation of Japanese Art Swords authenticated this tanto as the work of Kunihisa of the Uda school and issued a Hozon certificate. Kunihisa was the son of Kunifusa. The Uda school traces its origins to Kunimitsu, who migrated from Uda in Yamato Province (present-day Nara Prefecture) to Etchu Province in the late Kamakura period, producing outstanding swordsmiths like Kunifusa and Kunimune.

Considering its age, the preservation is exceptionally superb, with absolutely no flaws. It is in such fine condition that it could easily be displayed in a museum. The jigane exhibits well-kneaded itame grain, with visible chikei and yubashiri. The hamon is a slender sugaha reminiscent of Yamato-den, crafted for practicality yet achieving ultimate beauty.

The nakago is ubu and unsigned, but with such superb preservation and the aura of the Koto period, this piece deserves a place in your collection.

  • Blade length: 24.4 cm
  • Curvature: Inward
  • Number of Mekugi hole: 1
  • Motohaba: 25.2 mm
  • Motokasane: 5.7 mm
  • Signature: No signature
  • Era: Koto
  • Structure: Hira-zukuri, Iori-mune
  • Jigane: Itame
  • Hamon: Hoso-suguha
  • Boshi: Massugu Haitte Togatte Kaeru
  • Weight: 140 g(blade only)
  • Nakago: Ubu
  • Koshirae: Shirasaya
  • Original Registration No.: Tokyo 284454

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