Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
NihontoWatchNihontoWatchSpecifications : Mei (Signature) : 波平貞偶 (Naminohira Sadaku) Type : Katana Period : late Muromachi With BO-HI Blade Length : 63.4 cm Curvature (Sori) : 0.9 cm Width at the Kissaki : 39mm Motohaba (Width at the base) : 28.5mm Motokasane (Thickness at the base) : 7mm Blade's Total Length : 81.4 cm Total Sheath (Saya) Length : 89.5 cm Blade Weight : 531g Total Weight (including sheath) : 872g Description: The blade presents a signature of Naminohira Sadaku. The ji-hada (texture of the blade's surface) displays a beautifully crafted masame-hada, which resembles straight grain patterns. The steel's texture (jigane) has a refined quality, demonstrating a well-forged luminous foundation. The hamon (temper pattern) reveals a straight pattern (suguha) with a shallow wave (notare), which is subtly interspersed with small irregularities (ko-midare). The boshi (temper line in the tip or kissaki area) appears to be in a swept manner (hakikake) with a slight turn-back. The nakago (tang) appears to be polished (mune is polished), with three mekugi-ana (peg holes). The yasurime (file marks on the tang) are in a slanting pattern, known as sujikai. The blade seems to be in an old polish but is still in a condition appreciable for collectors. The sword comes with a white saya (sheath), which bears an inscription, likely referring to its attribution to the Eisho era during the late Muromachi period. Historical Context: The Naminohira school, originating from the Satsuma province, has a history that spans several centuries. While not as renowned as the major sword-making traditions like Bizen or Soshu, the Naminohira smiths produced a significant number of quality swords, especially during the Kamakura and Muromachi periods. Naminohira Sadaku would have been one of the smiths from this school, producing blades during the tumultuous late Muromachi period, a time of significant warfare and social upheaval in Japan. The period is marked by the rise of powerful daimyo (feudal lords) who woul
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The Naminohira school traces its origins to the late Heian period, when a swordsmith named Masakuni migrated from Yamato Province and established himself at Naminohira in Taniyama District, Satsuma Province. His son Yukiyasu succeeded him, and the lineage continued unbroken into the late Edo shinshintō era. The collective term Ko-Naminohira designates smiths and works dating no later than the Nanbokuchō period, distinguishing the school's formative generations from later practitioners. This geographic isolation in southern Kyushu allowed the development of a distinctive regional aesthetic that balanced mainland influences with local forging traditions. The school's technical identity reveals a pronounced Yamato character in both construction and tempering, yet the forging exhibits a characteristic density and slight tenacity (nebari) that distinguishes Naminohira work from its Yamato antecedents. The jigane typically shows strongly flowing itame-hada, often with a whitish cast and well-adhering ji-nie, while thick chikei appear throughout the ground. In the hamon, a fine hoso-suguha or narrow suguha-based temper predominates, with the nioiguchi displaying a distinctive urumi tendency—a moist, soft quality that creates a subdued, somewhat shizumi-inclined appearance.
A diagnostic feature appears at the hamachi, where slight yaki-otoshi marks the transition from untempered to tempered steel. The school's Nanbokuchō-period works often present extended ō-kissaki and deep koshizori, embodying the martial aesthetic of that turbulent age. The Naminohira tradition experienced a renaissance during the Edo period, producing masters such as Ichi Heian Yasushiro, who in Kyōhō 6 (1721) was summoned to forge for Shōgun Tokugawa Yoshimune. His exceptional skill earned him the privilege of engraving the ichiyō aoi crest on his nakago and the court appointment of Shume no Suke. His work and that of his contemporary Masakiyo represent the apex of Satsuma shintō, demonstrating how provincial schools could achieve recognition at the highest levels of Tokugawa society. The scarcity of early signed works, particularly from the Kamakura and Nanbokuchō periods, renders extant examples invaluable for understanding the school's development and its role in transmitting Yamato forging methods to Japan's southern frontier. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Yukiyasu行安 | 1308-1311 | 9 |
| Yasutsuna安綱 | 1288-1333 | 0 |
| Yasutsugu安次 | 1224-1225 | 0 |
| Yasutsugu安次 | 1375-1381 | 0 |
| Haruyuki治行 | 1394-1428 | 1 |
The Muromachi period (1392 to 1573)
Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
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