Gold Made Tortoiseshell Patterned Waist Sword Mounting

A Dagger Sheathed in Gold: The Nobukuni Koshigatana of the Hosokawa

The scabbard of this small sword is wrapped from mouth to tip in thin sheet gold, hammered into a lattice of linked hexagons. Look closely and you find two tiny emblems taking turns inside the cells: a kuyō, a central disc encircled by eight smaller ones, and a hanabishi, a four-petalled bloom pressed into a diamond. The repeating hexagon grid is a pattern the Japanese call kikkō-tsunagi, "linked tortoiseshell," and here it runs the full 34.8 centimetres of the scabbard without losing its rhythm.

This is a koshigatana, a guardless short sword once worn thrust through the sash at the waist. Catalogued as the Gold Koshigatana Mounting with Linked-Tortoiseshell Design, with a blade signed Nobukuni, it pairs two different ages. The mounting belongs to the Momoyama period of the late sixteenth century, when sword dress turned ostentatious; the blade inside it was forged earlier, in the Muromachi period, by a smith of the Nobukuni line of Yamashiro Province (present-day Kyoto). On 6 June 1985 the pair was designated an Important Cultural Property. The whole assembly measures 47 centimetres from end to end, with a hilt of 12.2 centimetres.

It is held privately, in Tokyo, and is not on regular public view. What follows is a guide to reading the object and to the world it came from.

Gold Without a Crossguard: The Mounting

The fitting is built in the aikuchi manner, which dispenses with the disc-shaped guard that separates hilt from blade on most Japanese swords. Hilt and scabbard meet flush, mouth to mouth, so the eye travels along one continuous gilded line. The hilt is covered in kin-uchizame, the pebbled skin of a ray treated to read as gold, joined down the centre of the underside. The scabbard's gold sheet is closed along the back ridge, the seam kept off the display face.

Momoyama taste favoured this kind of display. After a century of plain, sober mountings, swordsmiths and their patrons began dressing hilts and scabbards in polished ray skin, gold foil, and spiralled gold wire. A small sword sheathed entirely in patterned gold was a statement of rank as much as a weapon, and few such pieces survive intact. That scarcity is a large part of why this one was singled out.

The metal fittings reward slow looking. The collar and pommel, the fuchigashira, are worked in shakudō, a copper-gold alloy patinated to a deep blue-black, with a fine fish-roe granulation called nanako stippled across the ground. Against it sit two crests in coloured high relief: the paulownia and, again, the nine-luminary kuyō that patterns the scabbard. A thin gold rim frames each piece. The grip ornaments, the menuki, take the form of a single lion modelled fully in gold. The handle of the little accessory knife, the kozuka, carries a lion among peonies in gold relief over a gold nanako field. Even the small cord-knob and the hook that steady the sword in the sash, the kurikata and origane, are gold, their surfaces filed and then engraved in hairline kebori with cranes, tortoises, pines, and bamboo, the old emblems of long life.

The Blade Within, and the Carvings That Date It

Draw the blade and the register changes from courtly gold to disciplined steel. It is a small wakizashi of hira-zukuri form, flat-sided with no central ridge, 31.8 centimetres long and barely curved at 0.2 centimetres. The back is cut to three facets, a mitsu-mune. The surface grain is a flowing wood-grain itame, and across it drifts a soft shadow the swordsmiths call utsuri, a misty reflection of the temper line. That line itself, the hamon, is a straight suguha with a tight, clearly drawn edge of crystalline nioi. At the point the temper makes a shallow wave and turns back deeply in a small round komaru.

Carved into the steel are the clues to its meaning. On the face side a single Sanskrit seed-syllable stands for Fudō Myōō, the immovable wisdom king whose unflinching stillness symbolised a warrior's resolve, paired with a suken, a plain straight ritual sword. On the reverse, another seed-syllable names Bishamonten, the armoured heavenly guardian whom soldiers adopted as a protector. Such esoteric Buddhist carving was a signature of the Nobukuni school, which inherited the practice through the lineage of Yukimitsu, Masamune, and Sadamune.

The tang has been shortened a little over the centuries, ending now in a chestnut-shaped kuri-jiri with slanting file marks and three peg-holes, a record of its long working life. The signature reads simply "Nobukuni." The Nobukuni line began with a pupil of Ryōkai in fourteenth-century Kyoto and continued for several generations; the smiths of the early fifteenth century, who dated their work to the Ōei era, are the ones most often met with today, and a Muromachi-period Nobukuni such as this sits within that tradition.

The Gotō Hand and the Hosokawa Name

Two of the fittings, the lion menuki and the lion-and-peony kozuka, are thought to be the work of the Gotō family, the dynasty of metalworkers founded by Gotō Yūjō in the fifteenth century. The Gotō served the Ashikaga shoguns and later Nobunaga, Hideyoshi, and the Tokugawa, and their refined relief on nanako grounds became the standard of formal taste. The lion was one of their favourite subjects. The attribution here is traditional rather than signed, so it is best read as a strong likelihood rather than a certainty.

The mounting is said to have descended in the Hosokawa family and to have been carried by two of its most celebrated figures: Yūsai (Hosokawa Fujitaka, 1534–1610), the warrior and poet who held the secret transmission of the Kokin Wakashū, and his son Sansai (Hosokawa Tadaoki, 1563–1645), a daimyo counted among the seven foremost disciples of the tea master Sen no Rikyū. The family carried its treasures from the warring sixteenth century into the long peace of the Edo period, and much of that inheritance survives today in their old Tokyo residence. A small gold sword associated with such men is a thread back to the age when refinement and warfare were practised by the same hands.

Where to See the Hosokawa World

Because the koshigatana itself is privately owned, the nearest place to step into its world is the Eisei Bunko in the Mejirodai district of Tokyo's Bunkyō ward. The museum stands on the grounds of the Hosokawa family's former lower residence and keeps their inherited art and documents, swords and sword fittings among them, rotating the displays through several themed exhibitions a year. The collection numbers in the tens of thousands of objects and includes works graded National Treasure and Important Cultural Property.

Set on a wooded rise, the museum occupies a 1930s building once used as the family's estate office. Beside it lies the Higo-Hosokawa Garden, a strolling pond garden laid out on the old grounds, worth an unhurried half hour before or after a visit. From here the patterned gold of a Momoyama short sword feels less like a museum label and more like one surviving piece of a household that prized both the sword and the poem.