Hōchō Masamune: A National Treasure Tantō by Japan's Greatest Swordsmith

Among the many masterpieces attributed to Masamune, Japan's most legendary swordsmith, the Hōchō Masamune tantō (short sword) stands as a supreme example of the Sōshū tradition at its finest. This particular blade — unsigned yet unmistakably the work of Masamune — is one of three surviving tantō that share the celebrated name "Hōchō Masamune," all three of which have been designated National Treasures of Japan. The name "Hōchō" (meaning "kitchen knife") derives from the blade's unusually wide body and thin cross-section, which give it a striking resemblance to a culinary knife rather than a conventional dagger.

This specific Hōchō Masamune, formerly in the collection of the Naitō clan of Hyūga Nobeoka Domain, is widely regarded as the most dynamic of the three, displaying the most intense jikei (地景, patterns in the steel), kinsuji (金筋, golden lines), and inazuma (稲妻, lightning-like streaks) — hallmark features of the Sōshū school that Masamune perfected in the late Kamakura period.

Masamune: The Master Behind the Blade

Gorō Nyūdō Masamune (五郎入道正宗, c. 1264–1343) is universally acclaimed as the greatest swordsmith in Japanese history. Active in Kamakura during the late Kamakura period, he studied under Shintōgo Kunimitsu and brought to perfection the Sōshū-den (相州伝), one of the Five Great Traditions (Gokaden) of Japanese swordmaking. His revolutionary techniques in forging and heat treatment produced blades of extraordinary beauty and cutting ability, even at a time when the available steel was often impure.

Masamune is particularly celebrated for his mastery of nie (沸, martensitic crystals that appear like stars scattered across the blade), as well as the dramatic interplay of kinsuji and inazuma within his hamon (temper line). Most of his surviving works are unsigned, as it was the custom of the era for high-ranking presentation swords to bear no inscription. Despite this, his works are readily identifiable by their distinctive style and superior craftsmanship.

Why This Tantō Was Designated a National Treasure

This tantō received its National Treasure designation on November 22, 1952. Several factors contributed to this distinction. First, it is a quintessential example of Masamune's art: the steel and temper line are in excellent, healthy condition (地刃健全), preserving the blade's original beauty after more than seven centuries. Second, among the three surviving Hōchō Masamune tantō, this blade displays the most vigorous and dramatic metallurgical activity — the intense jikei, kinsuji, and inazuma patterns create a vivid, almost electric visual effect that is considered the very essence of the Sōshū tradition.

Third, the blade is recorded in the Kyōhō Meibutsu Chō (享保名物帳), the authoritative catalogue of famous swords compiled during the Edo period under the orders of Shōgun Tokugawa Yoshimune. Inclusion in this catalogue marks a sword as among the most historically significant and artistically accomplished blades in all of Japan. The tantō's impeccable provenance, tracing through several distinguished samurai clans, further attests to its enduring prestige.

The Fascinating Provenance

The history of this tantō reads like a journey through some of the most eventful chapters of Japanese history. The blade was originally purchased by the Hon'ami family — the hereditary line of sword appraisers and polishers who served the shōgunate — from a curio shop in Nagoya for a modest sum. It subsequently passed into the collection of Gamō Tadasato (蒲生忠郷), the second lord of the Aizu Domain. When Gamō Tadasato died without an heir in 1627, the domain was reorganized, and the tantō came into the possession of Naitō Tadaoki (内藤忠興), who was entrusted with Miharu Castle in the Gamō territories.

When the Kyōhō Meibutsu Chō was compiled, the blade was recorded as being in the collection of Naitō Yoshishige (内藤義稠), the fifth lord of the Iwaki-Taira Domain. After his death in 1718, the tantō passed to his adopted son and successor, Naitō Masaki (内藤政樹). In 1747, Naitō Masaki was transferred to Hyūga Nobeoka Domain (in present-day Miyazaki Prefecture), and the blade accompanied the family to their new seat, remaining in the Naitō family's possession for generations.

In the modern era, the tantō was acquired by the Okayama industrialist Okano Tarōmatsu (岡野多郎松), and later passed to his wife Okano Katsuno (岡野勝野). Today, it is held in a private collection in Osaka Prefecture.

Highlights and Points of Appreciation

For visitors and sword enthusiasts, the Hōchō Masamune offers several remarkable points of appreciation. The blade's hira-zukuri (flat) construction with an extremely thin cross-section and broad width immediately sets it apart from conventional tantō. This distinctive silhouette — the very reason for its "Hōchō" (kitchen knife) nickname — is a striking departure from the typical narrow-bodied dagger.

The steel surface (jigane) features a rich itame-hada (wood-grain pattern) with abundant jinie (地沸, crystalline particles across the surface). Within the steel, dramatic jikei, kinsuji, and inazuma patterns create a vivid landscape of bright lines and shifting textures that seem to come alive under changing light. The hamon (temper line) exhibits a gentle notare (undulating) pattern mixed with irregular elements, producing the wave-like effect for which Masamune's work is famous.

The tantō also features horimono (carvings): a gomabashi (護摩箸, ritual chopsticks used in Buddhist fire ceremonies) is carved in openwork (sukashi-bori), with tsume (claws) carved below — motifs associated with Fudō Myō-ō, the wrathful Buddhist deity of immovable wisdom. These carvings, likely executed by the renowned carver Daishimbō Yūkei, add a layer of spiritual significance to an already extraordinary blade.

The Three Hōchō Masamune: A Comparison

All three Hōchō Masamune tantō are designated as National Treasures, making this group name one of the most celebrated in the world of Japanese swords. The first is held at the Tokugawa Art Museum in Nagoya, having been passed down through the Owari Tokugawa family. It is notable for its openwork sword carvings (sukashi-bori of a ken) that pierce through both sides of the blade. The second belongs to the Eisei Bunko Foundation in Tokyo, formerly in the Hosokawa family collection via the Okudaira-Matsudaira clan. It was once the prized sword of Ankokuji Ekei, a diplomat-monk of the Sengoku period.

This third tantō — the Naitō family version now in a private Osaka collection — is distinguished by having the most intense and vibrant metallurgical activity of all three. While each of the three exhibits the same fundamental forging style and method, this blade's particularly dramatic expression of jikei, kinsuji, and inazuma makes it a favorite subject of study for sword connoisseurs.

Visiting Opportunities

Because this particular Hōchō Masamune is in a private collection, it is not on permanent public display. However, it has occasionally appeared in special exhibitions at major museums across Japan. Sword enthusiasts should watch for announcements from institutions such as the Tokyo National Museum, the Kyoto National Museum, and other venues that periodically host exhibitions of National Treasure swords.

Those wishing to see one of the other two Hōchō Masamune can visit the Tokugawa Art Museum in Nagoya (though exhibitions rotate, so it is wise to check the schedule in advance) or the Eisei Bunko Foundation in Tokyo. In addition, Masamune's legacy can be explored at Honkaku-ji Temple in Kamakura, where Masamune's grave is located, and at the Masamune Kōgei workshop, still operated by descendants of his lineage.

Surrounding Attractions

For visitors inspired by the world of Japanese swords, several related destinations are worth exploring. In Nagoya, the Tokugawa Art Museum houses an extensive collection of treasures from the Owari Tokugawa family, including swords, armor, and the famous Tale of Genji scrolls. The Nagoya Sword Museum (Meihaku) is another excellent destination dedicated to Japanese swords.

In Kamakura, visitors can walk in the footsteps of Masamune himself. Honkaku-ji Temple holds his gravesite, and the Masamune Kōgei Bijutsu workshop — run by descendants of the master — continues the tradition of Sōshū bladesmithing. The Tsurugaoka Hachimangū Shrine and the Great Buddha of Kōtoku-in are nearby landmarks that round out a rewarding cultural visit.

For a broader exploration of Japanese sword culture, the Japanese Sword Museum (Tōken Hakubutsukan) in Tokyo, operated by the Society for the Preservation of Japanese Art Swords, offers rotating exhibitions of important blades and hosts educational programs about the art of the Japanese sword.