Sword (Unsigned, Attributed to Kunitoshi)

A Kamakura Blade That Lost Its Name

The tang of this sword carries no signature, and that silence is where its story begins. The blade runs 66.9 centimeters along its cutting edge, a single clean curve of polished steel, and it looks entirely complete. Yet it was not born in this shape. It started as a longer tachi, a sword worn edge-down and slung from the belt, forged during the Kamakura period (1185 to 1333), the era most Japanese collectors regard as the high point of the swordsmith's craft.

Sometime in a later century the blade was cut down at the base, a reworking called ō-suriage, or major shortening. Warriors of the late medieval period had begun to carry their swords edge-up, thrust through the sash, and an old long tachi could be shortened to suit the newer fashion. The trade-off was permanent: shortening the tang removed the exact stretch of metal where the maker had once chiseled his name. The signature went with the steel that was filed away.

What remained was the work itself. Reading the forging and the temper, generations of appraisers have placed it in the hand of Kunitoshi, a leading smith of the Rai school in Kyoto. The official record states the attribution plainly while keeping the honesty of an unsigned piece: this is a sword attributed to Kunitoshi, not one he autographed.

The Rai School and a Question of Two Kunitoshi

The Rai school worked in Yamashiro Province, the old province surrounding the imperial capital at Kyoto, and rose to prominence from the middle of the Kamakura period. Its smiths were known for a calm, disciplined aesthetic, often a quiet straight temper line. Rai Kuniyuki, regarded as the father of the smith named here, helped set that reputation.

Kunitoshi pushed in a bolder direction. Alongside the school's restraint he was willing to fire a showier, more active temper and to give his blades a robust, commanding stance. There is a long-standing puzzle attached to his name. Some surviving swords are signed with only the two characters that read "Kunitoshi," while others carry three characters reading "Rai Kunitoshi." Scholars have argued both that these are one man who changed how he signed over his career, and that they are two separate smiths, perhaps father and son. The work in front of you belongs to the first group, the style associated with the two-character signature, conventionally called Niji Kunitoshi.

Because the signature is gone, how can anyone narrow the attribution at all? The decisive clue sits in the point. The temper pattern that runs up into the tip, the bōshi, turns in an irregular, gathered manner rather than the simpler sweep an earlier Rai smith such as Kuniyuki tended to leave. That behaviour in the point, read together with the way the blade has been handed down, is what led specialists to settle on Kunitoshi over the alternatives.

What Rewards a Close Look

A sword of this rank is meant to be studied slowly, tilted under a single light so its surfaces wake up. Three things repay the attention.

First, the steel itself. The body shows ko-itame, a fine wood-grain pattern produced by folding the metal many times during forging, and across it lies a scatter of ji-nie, tiny crystalline particles that catch the light like frost. Look longer and a faint utsuri appears, a cloudy reflection floating above the hardened edge, a feature prized in the best Kamakura work.

Second, the temper line, or hamon. Here it is broad and gently undulating, a shallow notare into which smaller clove-shaped and irregular forms are mixed, with fine "legs" and "leaves" of activity reaching toward the edge. The hardened zone is wide and leans toward nioi, a soft misty band rather than a sharply granular one, with enough nie brilliance to keep it alive.

Third, the shape. The blade is generously wide, and the point carries the slightly stubby, full character that swordsmiths of the mid-Kamakura period favoured. The combination gives it a planted, confident presence that a thinner later blade rarely matches. The reason it earned designation as an Important Cultural Property in 1950 comes down to this pairing of quality and survival: among blades attributed to Niji Kunitoshi, this one is exceptionally healthy, its forging and temper fully intact after seven centuries.

Seeing It in Nagoya

The sword is held in Aichi Prefecture, in the collection of the Tōken World Foundation, a private body with one of the largest holdings of Japanese arms and sword fittings in the country. Its flagship venue is the Nagoya Touken Museum, known by its nickname Meihaku, in the Sakae district at the center of Nagoya.

Like most museums that care for blades, Meihaku rotates what is on view, since prolonged exposure is hard on both the steel and its polish. A specific sword may or may not be out on the day you arrive, so it is worth checking the museum's current exhibition listings before a visit. Even when this particular blade is resting, the galleries display swords and armour spanning the Heian period to the end of the samurai age, which makes a stop here one of the easiest ways for a traveller to compare the work of different schools side by side.

The museum sits within walking distance of several subway stations, including Sakae, Fushimi, Ōsu Kannon, and Yabachō, and Nagoya Station is only a few minutes away by train. The neighbourhood rewards a longer day. The covered arcades of Ōsu, packed with second-hand shops, street food, and a venerable Kannon temple, are a short stroll south. Nagoya Castle and the Tokugawa Art Museum, the latter home to its own collection of National Treasure swords from the lords of the Owari domain, lie a little farther out and pair naturally with an interest in old blades.