Tachi〈Meisukebao〉

Tachi Signed Sukekane: A Surviving Old Bizen Blade at the Tokyo National Museum

A two-character signature, 助包 (Sukekane), sits near the base of an unshortened tang. The detail carries more weight than it first appears. Most long swords from the early sword age were cut down over the centuries as the way of carrying them changed, and shortening a blade usually meant filing away the part that held the maker's name. This tachi, kept at the Tokyo National Museum in Ueno, held on to its full original tang, so the name Sukekane reads in exactly the spot where the smith cut it roughly eight centuries ago.

The blade runs 73.3 centimeters with a curve of 2.4 centimeters. The deepest point of that curve falls close to the hand rather than near the middle, the silhouette swordsmiths call koshi-zori, and it is one of the clearest signs of the oldest Bizen work.

A tachi was worn slung edge-downward from the belt, the mounting of mounted warriors before the shorter uchigatana became standard. Seen in a museum case, this one looks slender and upright, with a quiet temper line rather than the flamboyant patterning of later centuries.

Sukekane and the Old Bizen Smiths

Sukekane worked within the group of smiths now called Ko-Bizen, or Old Bizen, the earliest forging tradition of Bizen Province in what is today the eastern part of Okayama Prefecture. Bizen became the most productive sword country in Japan for a reason: the Yoshii River valley yielded clean iron sand, and forges clustered along the water for centuries. The names cited most often from this first generation are Tomonari and Masatsune, smiths of the late Heian period whose blades are now counted in handfuls.

Few Old Bizen pieces survive at all. The tradition predates the boom in sword making that came with the warrior society of the mid-Kamakura period, so the early work was never produced in large numbers and has had eight hundred years to be lost, broken, or reforged.

Sukekane is a slightly complicated name in the record books. It appears among the Old Bizen smiths and also among the smiths of the Fukuoka Ichimonji school that rose a little later in the same province. Specialists still disagree over which signed blades belong to which group, and the argument turns partly on the size of the cut characters and partly on the character of the temper. The national registry lists this blade simply under the name Sukekane and dates it to the Kamakura period; the Old Bizen tradition itself reaches back across the line into the late Heian years.

Why It Is an Important Cultural Property

The sword entered the national register as an Important Cultural Property on 29 August 1950, the day Japan's Cultural Properties Protection Law took effect and a great many earlier-protected works were carried over under the new system. Three qualities explain why it earned the listing: it is signed, it is early, and it survives in honest condition.

Look closely and the forging tells the story. The surface shows a fine wood-grain pattern, ko-itame, with a soft whitish shadow called midare-utsuri rising and falling above the temper line. The temper itself stays close to straight, broken by small irregular crests, and it is set in deep nioi, the misty crystalline band along the edge, with coarser nie particles gathering through it and short ashi reaching down toward the cutting edge. The tip carries a shallow irregular temper that turns back only slightly. These are the restrained marks of early Bizen forging, a different register from the showy clove-shaped temper that the later Ichimonji masters made famous.

That the tang is ubu, never shortened, is part of the value as well. It keeps the original file marks, the chestnut-shaped end, the two peg holes, and the signature in their first arrangement. For a blade this old, an intact tang is the exception, not the rule.

What to Look For

Stand to one side of the case first and read the profile. The curve gathering toward the hilt, the slender body, the small point: this is the early-Bizen line, closer to a Heian aristocrat's weapon than to the broad blades of a century later.

Then move the eye along the surface. A straight groove, the bō-hi, runs the length of both faces and lightens the blade in the hand. Tilt your gaze until the case light skims the steel and the midare-utsuri appears, a faint cloud-like band that floats clear of the hardened edge; it is one of the most satisfying things to catch on an Old Bizen sword, and it does not photograph easily. Where the light is right, fine bright lines called kinsuji flicker inside the temper on the front face.

If the tang is shown, the signature is the reward. Two characters, cut clean, in the place the smith chose. Sword displays at the museum rotate, so this particular blade is shown only from time to time rather than year-round. Anyone making a special trip for it should check the museum's current listings first.

Around the Museum

The Tokyo National Museum sits at the northern end of Ueno Park, about a ten-minute walk from JR Ueno Station through the park's main avenue. Japanese swords are shown in the metalwork room on the first floor of the Honkan, the Japanese Gallery, alongside armor and sword fittings; the same building holds Buddhist sculpture, painting, ceramics, and textiles, enough to fill an unhurried half day.

The surrounding park rewards the walk over. Ueno holds several of the country's major museums, an old zoo, the Shinobazu pond, and Kaneiji temple, and the Ameyoko market lanes run south from the station for food and browsing. Plan the museum for the morning, when the galleries are quietest, and keep the afternoon loose.