NihontoWatchThe Mihara school of Bingo Province was located near both Bizen and Bitchu provinces, yet it was influenced by neither the Bizen-den nor Yamashiro-den, consistently adhering to the Yamato-den from the late Kamakura period until the late Muromachi period; while Masaie was traditionally considered the founder, since all dated works by said smith are from the Nanboku-cho period, the theory that Sukekuni of Kokubunji from the late Kamakura period is the founder has recently become prominent. The Mihara school is broadly divided into three periods by era: those from before the Nanboku-cho are called Ko-Mihara, those from the early to mid-Muromachi are called Mihara, and those from the late Muromachi are called Sue-Mihara. Furthermore, the Mihara school has been highly regarded since ancient times, and even today, many swords are designated as Important Cultural Properties or Important Art Objects by the national government, receiving high praise in these circles. This katana, although greatly suriage, boasts an elegant sugata with a difference in width between the moto and saki and a chu-kissaki that is slightly nobikokoro; the jigane is ko-itame mixed with moku with masane-nagare, containing chikei, and showing a slight hada-tachi quality with a faint shirake-utsuri appearing, while the hamon has a bright and clear nioiguchi, fired as a tight nioiguchi suguha without any flaws. Although it appears to be a monotonous suguha, detailed observation reveals many extremely small hataraki, and the boshi is sugu returning in a maru shape at the saki. The accompanying tachi koshirae is finished in a blackish shu-ishime-nuri, combining robustness with a sense of dignity. All the kanagu are made of yamagane, standing out with a unified beauty featuring a warabite design. The tsuka does not use samegawa or nishiki, but instead features metal intricately carved with surging waves, and by wrapping thin leather only at the top and bottom, it shows a sturdy construction emphasizing practicality. The tsuba is likewise a sturdy maru-gata made of yamagane, where the figure of a dynamic amaryu is carved out, adding a powerful atmosphere. While common itomaki-no-jin-tachi koshirae are often seen, a tachi koshirae with such a unique style as this work is extremely rare, and it is also very precious in that every single piece, down to one seppa, has been preserved completely in its original state. If displayed in a tokonoma, it can be called an exceptional masterpiece that radiates a truly majestic presence. There is no rattling in the tsuka and it is firm, but there is tsuba-nari. When held after removing the saya, the balance is very good with the center of gravity near the hand, making one keenly feel that it is a construction designed with practicality as the first priority.
Offered by Toushin
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As written by the shop
Machine translation from the shop's Japanese · may contain errors ·
Yamato-den · Bingo
31 pieces on the market now
The Mihara school arose in Bingo Province during the late Kamakura period and maintained continuous production through the end of the Muromachi period. The region's ancient reputation as a center for iron goods—documented as early as Engi 14 (914) in the Seiji Yōryaku—provided the technical foundation for this sustained tradition. Because Bingo contained numerous landed estates (shōen) belonging to major Kinai temples and shrines such as Tōji and Rengeō-in (Sanjūsangendō), the smiths working at Mihara engaged in regular interchange with the central provinces. This geographical and economic relationship accounts for the pronounced Yamato temperament observable throughout the school's output. The term "Ko-Mihara" (Early Mihara) designates works produced from the late Kamakura through the Nanbokuchō period, with Masaie and Masahiro recognized as the lineage's most accomplished masters. Ko-Mihara workmanship reveals a distinctive fusion of Yamato influence and regional character. The forging typically exhibits itame-hada mixed with conspicuous mokume and flowing grain (nagare), often with a tendency for the texture to stand (hada-dachi). Fine ji-nie adheres throughout the steel surface, and a characteristic whitish cast (shirake-utsuri) appears prominently—a feature repeatedly cited in appraisals as diagnostic of the school. The tempering follows Yamato convention in emphasizing suguha, but the nioiguchi tends toward tightness (shimarigokoro) with well-adhering ko-nie rather than the more vigorous nie activity seen in Yamato proper.
Along the hardened edge, smiths frequently introduced hotsure, uchi-noke, and subtle kuichigai-ba effects, while the nioiguchi often exhibits a subdued (shizumi) quality. The bōshi typically runs straight and turns back gently in ko-maru or rounded (maru) form, concluding with fine hakikake at the tip—a restrained finish characteristic of the school. Nanbokuchō-period examples display the era's monumental aesthetic: wide mihaba with minimal taper from base to tip, shallow curvature, high shinogi, and extended chū-kissaki or ō-kissaki, creating a dignified and powerfully robust form. The school's output demonstrates how peripheral traditions absorbed and transformed influences from established centers while maintaining regional identity. Ko-Mihara blades occupy a position intermediate between the vigorous nie-work of Yamato proper and the more subdued aesthetic preferences of western Japan. This balance—robust construction paired with restrained tempering, standing grain texture combined with tight nioiguchi, and Yamato-derived suguha inflected with local characteristics—defines the school's technical achievement. The whitish forging, conspicuous mokume, and gentle bōshi became recognized signatures that distinguished Mihara work from its Yamato models. Through four centuries of continuous production, the smiths of Mihara maintained technical standards sufficient to supply both local demand and broader military markets, their works preserving a coherent school identity across generational transmission. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Nobumori信守 | 987-1596 | 0 |
| Sadakuni貞國 | 1441-1444 | 0 |
| Nobutsugu信次 | 1444-1449 | 0 |
| Nobuie信家 | 1394-1428 | 0 |
| Tomotsugu朝次 | 1394-1428 | 0 |
Yamato in the Muromachi period
The monasteries that had sustained Yamato lost ground through the Muromachi period, and the schools thinned with them; Sue-Tegai kept the old masame manner alive in quantity. The burning of Tōdaiji’s Great Buddha hall in 1567 closed the temple age.
Certifies a genuine blade worth preserving: a signature confirmed correct, or, if unsigned, an era, province, and school that the NBTHK can reliably identify.
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.
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