Yokoyama Sukesada and Osafune's Last Master Craftsmen: The Glory and Decline of Bakumatsu Bizen Swords

Successors of the Osafune Tradition and the "Yokoyama Family"

Osafune in Bizen Province (present-day Osafune Town, Setouchi City, Okayama Prefecture), Japan's largest sword-producing region continuing from the Kamakura period, prospered through the Northern and Southern Courts, Muromachi, and Sengoku periods before transitioning to the "shintō (new sword) period" in the Edo era.

The prominent Osafune family, the Yokoyama clan, was the last large-scale smith family to maintain the Bizen sword tradition from the mid-Edo period through the end of the shogunate. The head of the Yokoyama family, Yokoyama Sukesada—particularly the group of makers known as "Bizen-no-suke Sukesada"—has been subsequently regarded as a guardian of the Bizen tradition during the late shogunate period.

Historical Background of Yokoyama Sukesada

The signature "Sukesada" is a traditional name used by the Osafune school, with multiple generations and branch families employing the same name. This is a "hereditary succession of names" practice frequently seen in Japanese sword history.

The main lineages of "Yokoyama Sukesada" follow the sequence below.

• The first generation, who established the foundation of the Yokoyama family in the mid-Edo period (17th century)
• The representative makers of the shinshintō period active from the late Edo period through the end of the shogunate (Bizen-no-suke Sukesada)
• The Yokoyama family's final period, active until around the Sword Abolition Edict

Many swords bearing the "Sukesada" signature survive to the present day. This is because the Yokoyama family had established a mass-production system.

The Yokoyama family maintained their workshop in the old Osafune production area and continued smithing in a rural setting. While Osafune in the Edo period had lost its former prosperity, its traditional authority as "heir to the Bizen tradition" was preserved, and orders from daimyo and samurai throughout the country continued.

It is said that in the Yokoyama family workshop, disciples and members of their school worked on forging swords in a division-of-labor fashion under the direction of the head of the household. This is why even swords bearing the "Sukesada" signature show variation in quality depending on the maker and production period. When appreciating or purchasing such swords, it is necessary to avoid judging based solely on the signature characters, and instead to examine the condition of the jihada and hamon, as well as the content of the appraisal certificate.

Technical Characteristics of Late Shogunate Period Bizen Swords

The sword world of the late Edo period is called the "shinshintō (new-new sword) period," an era when such masters as Suishinshi Masahide and Taikei Naotane championed "revival of ancient-sword (classical) techniques." Yokoyama Sukesada, however, maintained an independent stance against this mainstream revival movement. While the revival of Yamato and Soshu traditions became fashionable, the Yokoyama family continued to preserve the characteristics of the Bizen tradition (nioi-jikō, chōji-midare, and bright jihada).

The appreciation points for Yokoyama Sukesada swords (particularly from the late shogunate period) are as follows.

Reading the Signature and Nakago—Key Points for Authenticity Verification

When appreciating or purchasing a Yokoyama Sukesada sword, one should pay attention to the condition of the nakago (the portion that fits into the handle). The signature (maker's name) is engraved on the nakago with a tagane (engraving tool), and the script style, placement, and file marks vary in characteristic by smith and period. Swords that have been used for many years develop rust and aged patina on the nakago over time, which is also evidence of sound preservation.

The "Sukesada" signature was used not only by the Yokoyama family but also by other Osafune-tradition smiths, so the same signature does not necessarily indicate consistent authorship or quality. Rather than relying solely on personal judgment to authenticate or identify the maker, confirming the appraisal certificate from specialized institutions such as the Japanese Art Sword Preservation Society (NBTHK) is fundamental to confident ownership. Appraisal certificates contain expert assessments regarding the blade's period, province of origin, and maker, and serve as crucial reference materials before purchase.

The Sword Abolition Edict and the End of Osafune

The Sword Abolition Edict of Meiji 9 (1876)—which prohibited samurai from wearing swords—dealt a devastating blow to the Japanese sword industry. The samurai class, which had been the primary customer base, ceased to exist, and orders for practical swords declined sharply. While there was some transition to military sword demand, industrial production could not be adapted, and many smiths closed their workshops between the Meiji 10s and 20s. The Yokoyama family also found continued sword forging practically impossible during this period, and the continuous tradition of the Osafune school came to an end in the Meiji era.

The decline around the time of the Sword Abolition Edict brought not only the closure of smithies but also cascading decline in peripheral industries such as tsuba makers, polishers, and handle wrapperers. The town of Osafune lost its function as a historic sword-making center and reverted to an agricultural region.

Basics of Storage and Maintenance

Japanese swords are metal artworks but also delicate instruments vulnerable to rust from moisture and perspiration. Whether it is a Yokoyama Sukesada blade or any other, the traditional maintenance procedure after appreciation involves wiping away fingerprints and perspiration from the blade with a soft cloth, and applying a thin coat of oil using uchiko and chōji oil.

For storage, it is standard practice to select a location with minimal humidity fluctuation and keep the blade in its saya (sheath) in a horizontal position. Sudden temperature changes and direct sunlight should be avoided, as they cause rust and sheath deterioration. Polishing (togi) and repair of blade chips should be entrusted to professional polishers; self-directed maintenance risks damaging the blade and should be approached with caution.

Evaluation of Surviving Works

In contemporary auctions and sword markets, late shogunate period "Yokoyama Sukesada" swords with appraisal certificates (preservation or high preservation grade) typically command 300,000 to 1.5 million yen. As Bizen-tradition late shogunate period works, they have steady demand, but rank below ancient swords and higher-grade shintō blades. Since many swords bearing the "Sukesada" signature exist, verifying the authenticity of the signature and period is crucial, and obtaining NBTHK appraisal is strongly recommended.

When considering a Yokoyama Sukesada sword, in addition to the presence or absence of an appraisal certificate, factors such as provenance (lineage), preservation condition, and the presence or absence of accompanying koshirae (mounting) and sword fittings also contribute to an overall value assessment. If purchasing through a specialist shop, the ability to consult in advance about the appraisal certificate content and blade condition is also reassuring.

Summary—The Final Flame of Osafune

Yokoyama Sukesada and the Osafune smiths of the late shogunate period maintained the flame of the Bizen tradition until the eve of the storm that was the Sword Abolition Edict. While their works do not reach the "golden age of ancient swords," they possess certain value as historical testimony that tells the final chapter of Japanese sword history from the Edo through Meiji periods.

The fact that the name Osafune continues to live today as synonymous with swords is thanks to the work of these final-period craftsmen. When holding a late shogunate period Bizen sword in hand, I hope you will sense that the conclusion of Japanese sword history is inscribed upon its blade. TOUKENZA's online catalog also carries late shogunate period Bizen swords, so please be sure to check our listings.