Antique Japanese Tantō, Signed "Ichinohira" (一平) — Unokubi-zukuri, Attributed to the Ichinohira Yasuyo Lineage of Satsuma, with Shimazu Family and Dr. Fukunaga Suiken Provenance

A rare cormorant's-neck (unokubi-zukuri) form in pristine, flawless condition, carrying a documented history as a Shimazu family heirloom, recovered from the United States in 1976 by the renowned sword scholar Dr. Fukunaga Suiken

We are pleased to present a remarkable unokubi-zukuri tantō signed "Ichinohira" (一平), associated with the famous Ichinohira Yasuyo (一平安代) lineage of Satsuma Province, preserved in pristine, flawless condition. Housed in a shirasaya with historic sayagaki, this blade carries an extraordinary provenance: documented as a treasured heirloom passed down through the powerful Shimazu family of Satsuma, and later recovered from the United States in the fall of 1976 by the renowned sword scholar Dr. Fukunaga Suiken.

On the smith and provenance — Ichinohira (一平 / 一平安代)

The signature "Ichinohira" links directly to one of Satsuma Province's most celebrated Shintō-era masters, Ichinohira Yasuyo, who served the Shimazu clan and produced numerous revered masterpieces.

This piece carries an exceptional historical lineage verified by its sayagaki:

1. Shimazu family heirloom: Documented as an official piece handed down through generations of the Shimazu family, the rulers of Satsuma.
2. Post-war recovery: Like many fine Japanese swords, it was taken overseas following World War II, but was successfully recovered from the United States in the autumn of 1976 through the efforts of Dr. Fukunaga Suiken.

Workmanship and condition

The blade is preserved in flawless, pristine condition, entirely free of flaws, chips, or rust. The jigane is a finely wrought itame-hada (wood-grain pattern), presenting a clear and healthy steel surface. The hamon is a gentle, elegant notare (wavy temper line) crafted with subtle nuance. The bōshi (tip temper) enters straight (massugu) and turns back neatly in a compact circle (ko-maru ni kaeru), bringing a precise and balanced finish to the point.

Form

Crafted in the distinctive unokubi-zukuri (cormorant's-neck style), a striking structure in which the central ridge thins out before widening again near the point. With no curvature (mu-sori, 0.0 cm) and light in the hand (90 g, blade only), this form creates a dynamic, elegant silhouette that combines sleek grace with classical Japanese cutlery aesthetics.

The mounting and sayagaki (shirasaya)

The blade is safely housed in a clean, traditional shirasaya (plain wood resting scabbard). The scabbard features detailed black-ink sayagaki (inscriptions) written on both sides:

• Sashi-omote (front): "Ichinohira Yasuyo, passed down through the Shimazu family, blade length 5 sun 9 bu and a half"
• Sashi-ura (back): "This sword was recovered from the United States in the fall of 1976, Fukunaga Suiken"

Note on Fukunaga Suiken (福永酔剣, 1914–2003): Born in Kumamoto (real name Katsumi Fukunaga), he was a medical doctor, army lieutenant, and assistant professor at Kumamoto University, as well as one of modern Japan's most distinguished and influential Japanese sword researchers and authors.

Boasting a rare unokubi-zukuri form, pristine health, Satsuma Shimazu family provenance, and a documented post-war recovery history by Dr. Fukunaga Suiken — this Ichinohira tantō is a truly unique collector's treasure, rich in historical significance.

Specifications

• Type: Tantō (短刀), unokubi-zukuri with iori-mune; ubu, zaimei (signed); Shintō era; mu-sori (no curvature)
• Smith: Ichinohira (一平), of the Ichinohira Yasuyo (一平安代) line, Satsuma Province
• Signature (mei): "Ichinohira" (一平)
• Jigane: Well-wrought itame-hada
• Hamon: Gentle, elegant notare
• Bōshi: Massugu ni haitte ko-maru ni kaeru (enters straight and turns back in a small circle)
• Length of edge (nagasa): 17.9 cm (approx. 7.05 in / approx. 5 sun 9 bu 5 rin)
• Curvature (sori): 0.0 cm (mu-sori)
• Width at base (motohaba): 19.0 mm (approx. 0.75 in)
• Thickness at base (motokasane): 6.1 mm (approx. 0.24 in)
• Peg holes (mekugi-ana): 1
• Weight (blade only): 90 g
• Nakago: Ubu
• Condition: Excellent; flawless, free of rust or chips
• Mounting: Shirasaya, with historical sayagaki (Shimazu family provenance and 1976 US recovery inscription by Fukunaga Suiken)
• Registration No.: Osaka No. 80319 (大阪 第80319号)