In the Sengoku era the school served a second warrior court: the Later Hōjō at Odawara, whose patronage kept the Tsunahiro line forging hitatsura for the uchigatana age until the castle fell to Hideyoshi in 1590.
NihontoWatchNihontoWatchSummary This blade was signed by Sōshū Jū Hirotsugu (相州住広次) during the late Muromachi period. The name Hirotsugu was used by a line of swordsmiths active in Sagami Province (present-day Kanagawa Prefecture) from the Nanbokuchō period through the Muromachi period. These smiths belonged to the Sōshū tradition, one of the most celebrated schools of Japanese sword-making, whose lineage traces back to the legendary master Masamune. The Sōshū school is renowned for its sophisticated forging techniques and exceptional craftsmanship. The Hirotsugu lineage began during the Nanbokuchō period and continued through several generations into the Muromachi and Sengoku periods. According to the authentication paper issued by the NBTHK (Nihon Bijutsu Tōken Hozon Kyōkai), this blade dates to the late Muromachi period. Based on this attribution, it is believed to be a late-gen Hirotsugu, who was active during the late Muromachi period. Works by Sōshū smiths are highly prized today. As the Tōkai region became a major battleground during the Sengoku period, many swords were lost or destroyed through constant warfare and use. Consequently, surviving examples by Sōshū swordsmiths are relatively scarce, making this blade a particularly valuable example of the tradition. Soshu Den Swordsmiths residing in Soshu province (Today’s Kanagawa prefecture) used a particular sword-forging tradition called Soshu Den. And, Shimada school also used this tradition to forge blades. Shoshu Den was born in the middle of the Kamakura period (mid 13th century). Back then, the Yamato and Yamashiro traditions were highly developed, and there were a few renowned swordsmiths from those regions. However, the sword-forging practice was in its infancy in the Kanto area, where the Soshu region was located. At the beginning of the Kamakura government, which was established in 1185, the first Shogun, Minamoto Yoritomo, prioritized making a lot of rules to have its political stability. And he couldn’t afford to hire swordsmiths within the same region or train them. Therefore, the Kamakura government originally ordered weapons to the swordsmiths in the other areas, such as Yamato and Yamashiro. But, since the government was established, the demand for weapons increased exponentially in the government, and they had to figure out how to meet those demands from Samurai who served Kamakura shogunate. Then, the 5th head of the Shogun, Hojo Tokiyori, invited two renowned swordsmiths from other parts of Japan. They were Awataguchi Kunitsuna from Yamashiro province and Bizen Saburo Kunimune from Bizen province. And the 7th-gen Shogun Koreyasu Shino also invited Fukuoka Ichimonji Sukezane from Bizen province. It is said that those three swordsmiths played an essential role in creating the Soshu Den and making the foundation of the Soshu Den. Also another famous figure in the Soshu den is Intou Kunimitsu, an adopted son of Awataguchi Knitsuna. And Kunimitsu passed his excellent craftsmanship to Yukimitsu, his apprentice. And Masamune, one of the most famous swordsmiths in Japanese history, was an apprentice of Yukimitsu. And Masamune was the one that brought Shoshuden to nationwide fame. The tradition Masamune completed became an example of other swordsmiths who learned Soshu Den. Also, Soshu Den influenced many renowned swordsmiths during the Koto- Shinto era. One of examples is Inoue Shinkai from Osaka and Suishinshi Masahide from Edo. It is appraised as a Tokubetsu Hozon Token (特別保存刀剣) issued by NBTHK (Nihon Bijutsu Touken Hozon Kyokai: 日本美術刀剣保存協会). *Please keep in mind that there are a a couple of Kitae Kizu on this blade. Authentication Paper They authenticated the blade on February 16th in the 8th year of Reiwa (2026). They appraised it as Tokubetsu Hozon Touken, the blade especially worth preserving for Japanese society.
Soshu School相州派
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Soshu-den · Sagami
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The Soshu school took root in Kamakura, the seat of the Hojo regents in Sagami province, where the demand of the warrior government drew the country's leading smiths to a single town. The published sources count Awataguchi Kunitsuna of Yamashiro and the Bizen masters Kunimune and Sukezane among the immigrant pioneers of Kamakura sword-making, but the first native smith of Sagami, the man who cut his Kamakura residence and his dates into the nakago, was Shintogo Kunimitsu, reckoned the de facto founder of the Soshu-den. Working from the close of the thirteenth century into the 1330s, Kunimitsu built his refined manner on Awataguchi foundations: his tanto read at a glance like Yamashiro work until the conspicuous chikei and kinsuji in ji and ha betray the new tradition. From his forge came the three masters Yukimitsu, Masamune and Norishige, with Daishinbo Yukei as carving specialist and Kunihiro among the smith's own sons; through them the nie-laden suguha of the founder opened into the mature nie-deki that would define the school. A shared vocabulary runs through the whole register. The forging is itame mixed with mokume, the grain standing in places, covered in thick ji-nie with chikei entering abundantly, so the steel reads bright and clear in the manner the texts call particular to the upper rank of Soshu-den work. Over it the temper runs as a notare mixed with gunome, the nioiguchi deep, the nie thick, kinsuji and sunagashi working busily through the ha, with yubashiri drifting into the ji and a swept hakikake boshi above. From this common ground the internal arc unfolds.
Kunimitsu and Yukimitsu hold the restrained early hand, a calm suguha tending to shallow notare; Norishige carries the bold standing grain laced with thick chikei until the surface reads like pine bark (matsukawa-hada), his nioiguchi subdued and sunken. Masamune raises the nie to its highest refinement, a notare-based midareba alive with leaping kinsuji and chikei that the sources liken to splashed-ink (haboku) landscape painting; Sadamune, succeeding him in the mainline, works a calmer, more relaxed notare and excels as the carving master of the school. With Hiromitsu and Akihiro the temper escapes the edge entirely into the full-fledged hitatsura of Nanbokucho, tobiyaki and muneyaki firing the whole blade, Hiromitsu marked by his round dango-choji and Akihiro by a rougher, more openly active steel. A collector seeks Soshu for the nie itself, the most refined expression of hardened-steel artistry the tradition produced, and Masamune stands at its summit, his name carrying the heaviest weight of designation in the field and a place among Fujishiro's Sai-jo saku. To kantei the school is to read the recognition core the appraisers return to again and again: a chikei-rich standing itame, a deep and bright nioiguchi, busy kinsuji and sunagashi, and the swept boshi. The discriminations are fine and qualitative, Norishige's sunken nioiguchi and heavier grain set against Masamune's tighter quieter ji; Go Yoshihiro, who carried the manner west into Etchu, lit a degree brighter still with masame creeping into the hada and a deep ichimai-swept point; Yukimitsu kept the smaller, quieter pattern; Takagi Sadamune, who took the tradition into Omi, stood a touch more and ran shizumi in the nioiguchi where he fell short of the master. Because the great names left almost nothing signed, most of what survives is o-suriage mumei resting on Hon'ami attribution, and the signed meibutsu (the Kinoshita Masamune, the Mutsu Shintogo, the Okurikara Hiromitsu) carry provenance through the men who held the country: Oda Nobunaga, Toyotomi Hideyoshi, Tokugawa Ieyasu, and the Maeda, Date, Hosokawa and Uesugi houses, with the highest blades resting in the great museums and shrines. The school's influence radiated outward, Norishige's pine-bark forging passing through Tametsugu to the later Etchu smiths and the perfected hitatsura reaching swordsmiths of other provinces, so that the Soshu-den became one of the five great traditions by which the whole field is read. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Masamune正宗 | 1288-1293 | 87 |
| Sadamune貞宗 | 1329-1331 | 88 |
| Go Yoshihiro義弘 | 1299-1302 | 53 |
| Kunimitsu國光 | 1293-1322 | 69 |
| Akihiro秋廣 | 1346-1370 | 28 |
Sōshū in the Muromachi period
In the Sengoku era the school served a second warrior court: the Later Hōjō at Odawara, whose patronage kept the Tsunahiro line forging hitatsura for the uchigatana age until the castle fell to Hideyoshi in 1590.
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 siteReturns/exchanges limited to defects caused by shipping (except willful misconduct or gross negligence by the company); customers must contact within 72 hours of receiving the product.