Sword (Unsigned, Attributed to Kuniyuki)

A Katana in Osaka, Read as the Work of Kyoto's Rai Kuniyuki

In a private collection in Osaka Prefecture rests a long sword whose tang carries no signature, yet which generations of sword experts have read as the work of Rai Kuniyuki, one of the foremost smiths of medieval Kyoto. The Agency for Cultural Affairs designated it an Important Cultural Property on June 30, 1961, recording it plainly as a Kamakura-period blade attributed to Kuniyuki.

Kuniyuki led the Rai school, which rose in Yamashiro Province, the area that is now southern Kyoto, during the middle of the Kamakura period (1185 to 1333). The Rai smiths and the older Awataguchi smiths were the two great currents of Kyoto sword making, and from the mid-thirteenth century onward the Rai workshop gained the upper hand. The school's nominal founder was Kuniyoshi, but no reliably signed blade by him survives, so his son Kuniyuki is treated as its true founder. Tradition places Kuniyuki's career in the decades around the 1250s; his son Kunitoshi left a blade dated 1278, which helps fix the father's working years to the generation before.

How a Sword Loses Its Name

A first-time visitor to Japanese swords often asks the obvious question: if the blade is unsigned, how can anyone say who made it? The answer lies in two practices that shaped almost every old blade you will see in a museum case.

Kuniyuki worked in the age of the tachi, the long sword slung edge-down from the waist and drawn by a mounted warrior. Centuries later, as foot combat and changing dress made the shorter, edge-up katana the everyday weapon, many fine old tachi were cut down to suit the newer style. Shortening a blade meant trimming the tang, and the smith's chiseled signature, set near the base of that tang, was usually lost in the process. A great many works by the early masters therefore survive as unsigned blades.

Faced with such a sword, a connoisseur reads the metal itself. The grain of the polished surface, the pattern of the hardened edge, the curve of the body, the shape of the point: each carries the habits of a particular smith and school. A blade judged to show Kuniyuki's hand is entered in the record as "unsigned, attributed to Kuniyuki." The attribution is a considered judgment rather than a certainty, and specialists are candid that telling Rai Kuniyuki of Kyoto apart from the Yamato smith Taima Kuniyuki can be difficult, since the latter is said to have trained in the Rai tradition before settling near Nara.

Reading the Steel: What Marks a Kuniyuki Blade

Kuniyuki is remembered for working in two registers. Some of his swords are broad and commanding; others are slender and quietly elegant. Across both, the qualities that experts look for stay consistent.

The surface steel, the jigane, is a fine wood-grain texture with a soft, moist luster that the Rai school made its signature. Along the edge runs the hamon, the hardened temper line, often a broad and shallow band of straight temper into which clove-shaped shapes and small irregular bursts are mixed, alive with fine activity within the steel. On many Rai blades a faint cloudlike reflection, called utsuri, floats above the temper line. The point, or bōshi, tends to settle in a small, controlled turnback.

The school's standing is easy to measure in numbers. Among Kuniyuki's accepted works are one National Treasure, roughly fifteen Important Cultural Properties, and a further group of Important Art Objects, a record few smiths of any era can match. The single National Treasure is a tachi known as the Akashi Kuniyuki, named for the Akashi branch of the Matsudaira family that once owned it. Its blade carries a rare carved figure of a three-pronged ritual sword set into the groove, a flourish almost never seen on Kuniyuki's work and one reason the sword stands apart.

Where to Meet Kuniyuki's Hand

The Osaka katana is held privately and is not placed on public view, so it cannot be seen on a visit. Travelers who want to stand in front of Kuniyuki's work have a clear alternative. His one National Treasure, the Akashi Kuniyuki, belongs to the Japan Art Sword Preservation Society and is shown at its Japanese Sword Museum in Tokyo.

The museum sits inside the former Yasuda Garden in the Ryogoku district of Sumida City, a short walk from Ryogoku Station and close to the sumo arena. Its galleries change their displays on a regular cycle, so the Akashi Kuniyuki is not always out; check the current exhibition before you go. The area rewards a half-day on foot, with the garden, the Edo-Tokyo Museum nearby, and the river within easy reach.

To see more of the Rai school, the Tokugawa Art Museum in Nagoya holds a signed Kuniyuki tachi among the wedding furnishings of the Owari Tokugawa house, and the Tokyo National Museum rotates blades by Kuniyuki and his successors through its Japanese sword gallery. Seeing several Rai works in succession is the surest way to recognize the qualities that earned the Osaka blade its attribution.