NihontoWatchMihara Masanori was a swordsmith of the Kai-Mihara, a branch of the Sue-Mihara school, active around the Koji era, and his extant works are relatively few. The Mihara school of Bingo Province was close to both Bizen and Bitchu Provinces, but they were influenced by neither the Bizen-den nor the Yamashiro-den, consistently adhering to the Yamato-den from the late Kamakura period until the late Muromachi period. Conventionally, Masaie was considered the founder, but since all dated works by that smith are from the Nanbokucho period, the theory that Kokubunji Sukekuni of the late Kamakura period is the founder has recently become prominent. The Mihara school is broadly divided into three periods: those from before the Nanbokucho 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 of their swords are designated as Important Cultural Properties or Important Art Objects by the nation, receiving high acclaim in the field. The Kai-Mihara school refers to a group within the Sue-Mihara who included the character "Kai" in their names; there are various theories as to why they are called Kai-Mihara, with two prominent theories today: one being that it originates from the place name Kaigahara in Takamitsu-cho, Mitsugi-gun, Bingo Province, and the other being that it originates from the fact that they carved "Bingo no Kuni Mihara-ju Kai [Name]" in their mei. Additionally, some works by this school are designated as Juyo Token, and from the perspective of workmanship, they are a group of highly skilled swordsmiths. This wakizashi is a work by the second generation Masanori, who was active around the Tenbun and Koji eras of the late Muromachi period; among the few extant works by this smith, it is an elegant blade inscribed with a very precious Koji date. It has a refined sugata in namazuo-zukuri, and the jitetsu is primarily masame mixed with ko-itame and mokume, standing out with a deeply flavorful expression. The hamon, while the Mihara school is originally based on suguha, features a masterfully tempered hakoba-style edge similar to those seen in the Kanemitsu of the Osafune lineage, which is its greatest appeal. The yakidashi on the sashi-omote appears as if square teeth are lined up atop a suguha, the nioiguchi of the yakigashira smokes softly toward the ji, and long kinsuji appear on both sides near the fukura, fully demonstrating the outstanding dekiguchi and high skill of the second generation Masanori. The accompanying koshirae is a luxurious masterpiece that conveys its former appearance, having been carefully handed down through a distinguished family. The fuchi-kashira features a Takasago design, and the tsuba is a sukashi of paulownia and phoenix by the hand of the Kawaji family, a prestigious lineage of Choshu metalworkers, finished with a kin-fukurin of good gold color. The plum design of the menuki and the kozuka-bukuro adorned with a paulownia and phoenix design add color, and the tsuka, finished with high-quality jabara-maki, is particularly eye-catching. Furthermore, the seppa made of suaka with kin-kise and the beautiful kin-kise habaki from that time show that luxury was lavished on every detail, further enhancing the dignity of the blade.
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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.
A Hozon-certified blade judged to show notably superior workmanship and a better state of preservation. The bar is higher: re-tempered blades and most unsigned Muromachi/Edo works are excluded.
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 siteAs a rule we do not accept returns, except when we have sent a different item from the one ordered or when there is a significant discrepancy between the description and the item. If you wish to return an item, please contact us within 3 days of its arrival and then send it back.
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