Habaki, Koiguchi, and Sword Fitting Craftsmen: The Art of Japanese Sword Metalwork

Positioning of Japanese Sword Mounting Artisans

A Japanese sword (nihonto) consists of the blade (nakago included) and the external fittings (koshirae). Numerous metal fittings are used in the external portions. Artisans who specialize in making these fittings are collectively called kanagushi (metal fittings makers) or tosogushi (sword furniture craftsmen). Working in coordination with the koshiraeshi (master craftsmen who oversee the design of the entire koshirae), each kanagushi handles their respective area of specialization.

The external metal fittings serve both practical function and artistic value. Particularly after the Edo period, as the sword transformed from a weapon to an "ornamental object embodying the aesthetic sense of samurai" during times of peace, the design and technique of external fittings developed into a distinct field of fine craft.

Types of Major External Fittings and Their Artisans

Habaki Artisans

The habaki is a metal collar attached to the junction between the blade and the tsuka (handle) and saya (scabbard). It serves the practical function of securing the blade so it does not fall out of the scabbard, while also playing an aesthetic role in decorating the base of the blade.

Materials: Gold, silver, shakudo (oxidized copper), sukane (pure copper), shinchu (brass), and others

Techniques: Tankin (forging metal), chokin (engraving), zogan (inlay), kinkkise (gold overlay)

Habaki artisans work closely with sword smiths and polishers, and must make bespoke fittings with precise measurements of the nakago (tang), requiring high precision and material expertise. The actual workflow of a habaki artisan's day is detailed in Habaki Artisan's Day.

Tsuba Artisans

The tsuba is a circular or oval guard attached between the tsuka and blade. In tachi koshirae, it is used in combination with seppa (washers).

Historical Schools and Regions:

• Nanban tsuba: Openwork tsuba influenced by 16th-century Portuguese and Spanish designs
• Higo tsuba: Simple, martial-preference tsuba favored by the Kumamoto clan
• Edo tsuba: Decorative tsuba with intricate engraving and inlay work
• Kyo-sukashi tsuba: Elegant openwork tsuba favored by nobility and daimyo

In modern times, many tsuba artisans work as independent fine crafts artists, and many exhibit their works at NBTHK (Japanese Art Sword Preservation Society) tosogushi exhibitions.

Menuki Artisans

The menuki is a decorative metal fitting embedded beneath the tsukaitо (handle wrapping cord). These small three-dimensional sculptures serve both as a non-slip grip aid and as decoration.

Subjects: Dragons, hawks, waves, flowers and birds, weapons, hollyhock leaves (Tokugawa family crest), and many other themes

Techniques: Casting, tankin (forging), chokin (engraving), zogan inlay (using gold, silver, shakudo, shibuichi, and others)

Menuki artisan technique is a combination of fine casting and engraving, and is notably maintained by the Goto family (Gotoke) of the Edo period as an exclusive technical system. Details of the techniques are explained in Menuki Artisans.

Kozuka Artisans

The kozuka is the handle of a small blade stored on the exterior of the scabbard. It functions as a practical small tool while also possessing significant artistic value as a fine engraved decorative object. Many exceptional pieces are valued at hundreds of thousands to over a million yen for the handle alone.

Fuchigashira Artisans

The fuchi (collar) secures the koiguchi (mouth of the scabbard) end of the handle, while the kashira (pommel) covers the tip of the handle. Together, they form a pair that harmonizes the overall design of the handle. Fuchigashira are often commissioned as unified design sets along with menuki, kozuka, and tsuba, and this coordinated arrangement is called toriaawase (matched set) or mitate (artistic correspondence).

Fuchigashira artisans employ similar engraving and inlay techniques as menuki artisans, but must possess the compositional skill to fit designs flawlessly onto the limited curved surface of the handle. The overall aesthetic coherence of the koshirae is achieved through design collaboration among the kanagushi who work on the fuchigashira, menuki, kozuka, and tsuba.

Summary of Representative Techniques

Modern Artisan Conditions and Training Challenges

The population of external fitting artisans is even smaller than that of sword smiths and polishers, with reportedly only several dozen nationwide. The shortage of successors is severe, making technical transmission extremely difficult.

The main training pathways are as follows.

• Enrollment in metal crafts programs at Tokyo University of the Arts, Kanazawa College of Art, and similar institutions
• Apprenticeship in workshops (finding a master being the greatest challenge)
• Participation in workshops organized by the NBTHK and regional sword societies

Tosogushi (sword furniture) is an important evaluation factor in the appraisal and sale of Japanese swords, and the presence or absence of high-quality external fittings greatly influences trading prices. Determining the authenticity and production date of external fittings is done by comprehensively examining the presence or absence of a maker's signature (mei), the signature's execution, the color of the base metal, and the natural patina (nare-tsuya) that develops with age. The NBTHK issues authentication certificates not only for blades but also for sword furniture such as tsuba, menuki, kozuka, and fuchigashira, designating them as either preserved sword furniture (hozon-tosogy) or special preserved sword furniture (tokubetsu-hozon-tosogy). External fittings can receive official appraisal evaluation as standalone pieces. When purchasing or obtaining valuations, the presence or absence of an authentication certificate for individual pieces is an important clue in determining authenticity.

Care and Appreciation of External Fittings

Like the blade, external fittings are susceptible to sweat and skin oils, and direct contact with bare hands easily causes rust and discoloration. When viewing, the basic practice is to handle the fitting parts of the handle and guard indirectly, using cloth as an intermediary. Storage environment is also easily affected by humidity, so it is desirable to check the condition of external fittings periodically along with blade maintenance.

Points of interest when appreciating these fittings are as follows.

• Presence or absence of signature and its execution: When a craftsman's signature is engraved, the typeface and depth of incision provide clues to understanding the production background
• Base metal color and finish: Whether the distinctive coloration of the alloy, such as the black-purple of shakudo or the pale gray of shibuichi, is carefully finished
• Design coherence: Whether the tsuba, menuki, kozuka, and fuchigashira are commissioned with the same theme or technique (presence or absence of matching set)
• Condition from aging: Whether the piece displays a natural patina from long-term careful handling, rather than wear and dirt

These are perspectives that even non-specialists can gradually develop through careful observation of actual pieces or photographs.

Conclusion

External fitting artisans are the unsung heroes who ensure the artistic completeness of Japanese swords. Although they are important specialists on par with sword smiths and polishers, they lack public recognition, and their technical transmission has become one of the most urgent issues in contemporary Japanese sword culture. Understanding the specialized techniques of each artisan type—habaki, menuki, tsuba, kozuka, and fuchigashira craftsmen—cultivates a perspective for appreciating the Japanese sword not merely as a "blade" but as a "complete work of craft."