This tsuba features an eggplant design and is signed by Minayama Masaoki. Made in Kyoto, Yamashiro province during the late Edo period, it is crafted from shakudo with nanako ground and high relief carving with color accents. The tsuba has been certified as Tokubetsu Hozon by the NBTHK.
NihontoWatchmei · Edo
Machibori · around 1670
Kaizan Oki was a student of Otsuki Mitsuoki (Otsuki Koko) and a central figure in the succession of highly skilled craftsmen that the Otsuki lineage produced during the late Edo period. His common name was Naoichi, and he lived at Nijo in Kyoto. He initially signed his works as Oko, later changing the signature to Oki, and used art-names including Reibokudo and Chikufudo. The NBTHK situates him within a direct line of distinguished Kyoto metalworkers that includes Otsuki Mitsuhiro, Kawarabayashi Hideoki, Tenkodo Hidekuni, and Matsuo Gassan, a group that "enjoyed a period of great prosperity."
Oki's characteristic technique centers on yobori high-relief carving executed on solid gold (kinmuku) or shakudo grounds, brought to completion with oki-kin-iroe and polychrome metal accents in gold, silver, shibuichi, and suaka. His menuki display what the NBTHK describes as "the unrestrained, open manner characteristic of Kyoto machibori," marked by an "outstanding power of direct observation." His chisel control is consistently praised as "smooth and expansive," capable of rendering delicate leaf veins with crisp precision while modeling adjacent forms with "rich fullness." In his earlier works signed Oko, the carving shows earnest strength in each stroke of kebori and katakiribori, though it "has not yet reached the fluent and fully flowing manner seen in works signed Oki" — a distinction the NBTHK draws to chart his artistic maturation.
Across the Juyo record, Oki's work is characterized by compositions of "elevated tone and dignity," whether treating classical literary subjects such as Ise Monogatari or rendering mythological figures with "powerfully masculine" force. The NBTHK repeatedly affirms that his pieces "fully demonstrate the high technical level" of his art, describing them as works "in which Oki fully realized his abilities." His standing is summarized as that of "a key figure among Kyoto metalworkers," and his oeuvre reaffirms the continued vitality of the Otsuki school tradition at its highest level of accomplishment.
Where Oki/Masaoki/Minayama Oki stands among comparable artisans: across all of nihontō, and within tradition, era, and period. The tiers (Foremost · Leading · Major · Notable) weigh official designations from the NBTHK and Japan's Agency for Cultural Affairs, together with historical honors of lasting repute such as the Sansaku and Meibutsu-chō.
Select a lens to see how it's measured.
Machibori · Yamashiro
23 pieces on the market now
The Otsuki school is a distinguished lineage of Kyoto kinko (metalworkers) whose production spans from the mid-Edo period through the Bakumatsu era, consistently identified by the NBTHK as one of the most eminent metalworking lineages of the capital. " The school also acknowledged its debt to earlier Kyoto masters, with the NBTHK detecting in Mitsuoki's modeling the influence of Umetada Myoju and in his pictorial conception the influence of Kaneie. The collective technical vocabulary of the Otsuki school centers on takabori iroe (high-relief carving with polychrome metalwork), deployed with a fundamentally pictorial intelligence that distinguishes it from most other metalworking lineages. Across multiple generations, Otsuki artists worked in katakiribori (single-chisel engraving), hira-zogan (flat inlay), sukidashi-bori (relief modeling from the plate), and fine kebori (hairline engraving), often combining several techniques within a single composition. A defining characteristic is the school's command of varied ground materials -- iron, shakudo, shibuichi, oborogin, brass, and even solid gold -- finished as migaki-ji (polished), nanako-ji (fish-roe stipple), arashi-ji, or ishime-ji, each selected to serve the pictorial demands of the subject. " In subsequent generations, Atsuoki demonstrated daring compositional arrangements while maintaining an unmistakably Kyoto refinement, and Hidekuni achieved effects of "keen sharpness and driving momentum" through masterful deployment of irogane alloys.
Across the school's output, compositions characteristically make effective use of generous open space to achieve atmospheric depth, narrative pull, and a lyric quality that the NBTHK repeatedly identifies as distinctively Otsuki. The Otsuki school's legacy rests on its fusion of painter's sensibility with metalworker's discipline, producing works of a character at once bold and subtly graceful. " Atsuoki's commissions for both the Tokugawa shogunate and the imperial household -- including fittings for the wearing sword of the fourteenth shogun Tokugawa Iemochi and for Emperor Komei -- attest to the esteem in which the school was held at the highest levels of patronage. Hidekuni's later works exhibit "an airy and unconventional spirit" emblematic of Mitsuoki's own late manner, confirming that the school's aesthetic evolution was one of deepening refinement rather than mere technical inheritance. The NBTHK consistently positions the Otsuki school among Kyoto's most eminent metalworking traditions, and its members' works -- from Motohiro's ambitious narrative programs treating the Fifty-three Stations of the Tokaido to Kaizan Oki's compositions of "elevated tone and dignity" -- constitute an essential chapter in the history of late Edo-period chokinshi artistry. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Tokuoki篤興 | 1813-1891 | 20 |
| Mitsuoki光興 | 1766-1834 | 12 |
| Hidekuni秀国 | 1670 | 8 |
| Oki/Masaoki/Minayama Oki応起 | 1670 | 7 |
| Harutsura春貫 | — | 6 |
A Hozon-certified fitting of notably superior craftsmanship and condition, often with signature or workmanship of high reference value.
The NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai, the Society for the Preservation of Japanese Art Swords) is a public-interest incorporated foundation founded in 1948 and supervised by Japan’s Agency for Cultural Affairs (Bunkachō); it is based at the Japanese Sword Museum in Tokyo. Its expert panels physically examine each submitted work (shinsa) and issue a certificate (kanteishō) ranking it by artistic and historical merit. NBTHK papers are the most widely recognized standard of authentication for Japanese swords and fittings.
NBTHK official siteIf, due to our fault, the item differs significantly from its proper condition, the item may be returned. Cooling-off is within one week of the item's arrival.
This tsuba features an eggplant design and is signed by Minayama Masaoki. Made in Kyoto, Yamashiro province during the late Edo period, it is crafted from shakudo with nanako ground and high relief carving with color accents. The tsuba has been certified as Tokubetsu Hozon by the NBTHK.
NihontoWatchmei · Edo
Machibori · around 1670
Kaizan Oki was a student of Otsuki Mitsuoki (Otsuki Koko) and a central figure in the succession of highly skilled craftsmen that the Otsuki lineage produced during the late Edo period. His common name was Naoichi, and he lived at Nijo in Kyoto. He initially signed his works as Oko, later changing the signature to Oki, and used art-names including Reibokudo and Chikufudo. The NBTHK situates him within a direct line of distinguished Kyoto metalworkers that includes Otsuki Mitsuhiro, Kawarabayashi Hideoki, Tenkodo Hidekuni, and Matsuo Gassan, a group that "enjoyed a period of great prosperity."
Oki's characteristic technique centers on yobori high-relief carving executed on solid gold (kinmuku) or shakudo grounds, brought to completion with oki-kin-iroe and polychrome metal accents in gold, silver, shibuichi, and suaka. His menuki display what the NBTHK describes as "the unrestrained, open manner characteristic of Kyoto machibori," marked by an "outstanding power of direct observation." His chisel control is consistently praised as "smooth and expansive," capable of rendering delicate leaf veins with crisp precision while modeling adjacent forms with "rich fullness." In his earlier works signed Oko, the carving shows earnest strength in each stroke of kebori and katakiribori, though it "has not yet reached the fluent and fully flowing manner seen in works signed Oki" — a distinction the NBTHK draws to chart his artistic maturation.
Across the Juyo record, Oki's work is characterized by compositions of "elevated tone and dignity," whether treating classical literary subjects such as Ise Monogatari or rendering mythological figures with "powerfully masculine" force. The NBTHK repeatedly affirms that his pieces "fully demonstrate the high technical level" of his art, describing them as works "in which Oki fully realized his abilities." His standing is summarized as that of "a key figure among Kyoto metalworkers," and his oeuvre reaffirms the continued vitality of the Otsuki school tradition at its highest level of accomplishment.
Where Oki/Masaoki/Minayama Oki stands among comparable artisans: across all of nihontō, and within tradition, era, and period. The tiers (Foremost · Leading · Major · Notable) weigh official designations from the NBTHK and Japan's Agency for Cultural Affairs, together with historical honors of lasting repute such as the Sansaku and Meibutsu-chō.
Select a lens to see how it's measured.
Machibori · Yamashiro
23 pieces on the market now
The Otsuki school is a distinguished lineage of Kyoto kinko (metalworkers) whose production spans from the mid-Edo period through the Bakumatsu era, consistently identified by the NBTHK as one of the most eminent metalworking lineages of the capital. " The school also acknowledged its debt to earlier Kyoto masters, with the NBTHK detecting in Mitsuoki's modeling the influence of Umetada Myoju and in his pictorial conception the influence of Kaneie. The collective technical vocabulary of the Otsuki school centers on takabori iroe (high-relief carving with polychrome metalwork), deployed with a fundamentally pictorial intelligence that distinguishes it from most other metalworking lineages. Across multiple generations, Otsuki artists worked in katakiribori (single-chisel engraving), hira-zogan (flat inlay), sukidashi-bori (relief modeling from the plate), and fine kebori (hairline engraving), often combining several techniques within a single composition. A defining characteristic is the school's command of varied ground materials -- iron, shakudo, shibuichi, oborogin, brass, and even solid gold -- finished as migaki-ji (polished), nanako-ji (fish-roe stipple), arashi-ji, or ishime-ji, each selected to serve the pictorial demands of the subject. " In subsequent generations, Atsuoki demonstrated daring compositional arrangements while maintaining an unmistakably Kyoto refinement, and Hidekuni achieved effects of "keen sharpness and driving momentum" through masterful deployment of irogane alloys.
Across the school's output, compositions characteristically make effective use of generous open space to achieve atmospheric depth, narrative pull, and a lyric quality that the NBTHK repeatedly identifies as distinctively Otsuki. The Otsuki school's legacy rests on its fusion of painter's sensibility with metalworker's discipline, producing works of a character at once bold and subtly graceful. " Atsuoki's commissions for both the Tokugawa shogunate and the imperial household -- including fittings for the wearing sword of the fourteenth shogun Tokugawa Iemochi and for Emperor Komei -- attest to the esteem in which the school was held at the highest levels of patronage. Hidekuni's later works exhibit "an airy and unconventional spirit" emblematic of Mitsuoki's own late manner, confirming that the school's aesthetic evolution was one of deepening refinement rather than mere technical inheritance. The NBTHK consistently positions the Otsuki school among Kyoto's most eminent metalworking traditions, and its members' works -- from Motohiro's ambitious narrative programs treating the Fifty-three Stations of the Tokaido to Kaizan Oki's compositions of "elevated tone and dignity" -- constitute an essential chapter in the history of late Edo-period chokinshi artistry. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Tokuoki篤興 | 1813-1891 | 20 |
| Mitsuoki光興 | 1766-1834 | 12 |
| Hidekuni秀国 | 1670 | 8 |
| Oki/Masaoki/Minayama Oki応起 | 1670 | 7 |
| Harutsura春貫 | — | 6 |
A Hozon-certified fitting of notably superior craftsmanship and condition, often with signature or workmanship of high reference value.
The NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai, the Society for the Preservation of Japanese Art Swords) is a public-interest incorporated foundation founded in 1948 and supervised by Japan’s Agency for Cultural Affairs (Bunkachō); it is based at the Japanese Sword Museum in Tokyo. Its expert panels physically examine each submitted work (shinsa) and issue a certificate (kanteishō) ranking it by artistic and historical merit. NBTHK papers are the most widely recognized standard of authentication for Japanese swords and fittings.
NBTHK official siteIf, due to our fault, the item differs significantly from its proper condition, the item may be returned. Cooling-off is within one week of the item's arrival.
