After the Ōnin War broke the Ashikaga order, a century of Sengoku warfare armed nearly every province in Japan. The era rewards a discriminating eye: routine work exists in quantity, and beside it stand custom blades of the first rank.
NihontoWatchNihontoWatchSignature (Mei): Mumei Swordsmith: Attributed to the 下原(Shitahara) group School / Tradition: Shitahara school (Bushu / Musashi); Sōshū–Mino influenced workmanship Period / Province: Muromachi period / Bushu (present-day Hachiōji, Tokyo) Certificate: NBTHK Hozon(保存刀剣) Mounting: Shirasaya; metal habaki, 22.9 g Blade Length (Nagasa): 62.27 cm Curvature (Sori): 0.76 cm Mekugi-ana: 3 Shape: Shinogi-zukuri Jihada: Fine koto jihada with Shitahara traits; look for jorinmoku (如輪杢) whirlpool figure in places Blade Weight: 545.1 g (blade only) Habaki Weight: 22.9 g Saya Overall Length: 85.4 cm Motohaba / Motokasane: 2.816 cm / 0.728 cm Sakihaba / Sakikasane: 1.782 cm / 0.388 cm A koto katana certified NBTHK Hozon and attributed to the Shitahara group of Bushu (Musashi). Measuring 62.27 cm in nagasa with a gentle 0.76 cm sori, the blade presents a dignified shinogi-zukuri profile and a well-forged jihada praised in the listing. Three mekugi-ana reflect remounting over a long service life while maintaining healthy proportions. Shitahara blades often show steady forging with Sōshū–Mino influences. A hallmark to watch for is jorinmoku ( 如輪杢 )—small whirlpool-like figures in the steel surface—seen on representative works by Shitahara smiths. Swordsmith Background Shitahara is the historical smithing area in today’s Hachiōji City (Tokyo) . The school is said to have been founded by Yamamoto Norishige and prospered from the end of the Muromachi period into late Edo (late 16th–19th centuries). Shitahara smiths—known as Shitahara Kaji —first worked under the Hōjō clan. The celebrated Yasushige line begins with the first generation, originally signing Chikashige ; he adopted the character 「康」 (Yasu) from Hōjō Ujiyasu , changing his name to Yasushige . After the Hōjō were defeated by the Toyotomi during the Azuchi–Momoyama period, the Shitahara group served the Tokugawa as okakae kaji —official smiths retained by the feudal house—and continued forging through the Edo period. Many Shitaha
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The Shitahara group (下原) worked at Hachiōji in Bushū, the old province of Musashi, from the end of the Muromachi period and carried its forge on into the Edo period. The setsumei place the lineage among the swordmakers of Musashi in the kotō age and name Terushige, Yasushige, Hiroshige, and Chikashige as its leading hands, with the meikan recording Terushige across three generations: a shodai in Kyōroku, a nidai in Eiroku, and a sandai in Tenshō. " That same blade was made to order, in this case from Hagiwara Kaminao of Kōshū, marking the group as a working provincial forge serving its region. In the forging the setsumei return repeatedly to an itame-hada freely mixed with mokume that stands up rather than lying flat, the grain described as hada-datsu, often running to nagare near the edge and taking on an ayasugi-like, whorled or vortex-like cast in the jigane. The temper is a moderately undulating notare into which gunome enter, frequently in regular paired sequences, with pointed togariba, a chōji-like feeling at times, and ko-nie clinging along a nioiguchi that can settle into a subdued shizumi tone; sunagashi and ashi appear within the ha, and the bōshi tends to run midare-komi and turn back in maru. One katana sets gunome, ō-midare and angular elements into a notare, its bōshi sweeping off in hakikake.
The setsumei read this hand as a synthesis drawing on late Sōshū and the Muramasa line together with late Mino tendencies, which together account for the standing grain and the paired gunome. For kantei the markers are consistent: the risen mokume with its ayasugi turn, the regularly paired gunome, and a build suited to the uchigatana of the closing Muromachi years, often with pronounced sakizori and an extended chū-kissaki. Carving recurs, including bō-hi, bonji, gomabashi, and a deeply cut kurikara-ryū whose coiling tail the NBTHK singles out as characteristic. Named and dated pieces anchor the group: the Yamamoto Genjirō Terushige naginata, uncommon as a double-edged ryōba form, and a Terushige katana appraised between Eiroku and Tenshō that the register calls the hakubi of the school. The setsumei note that Shitahara work survives in number into the shintō period while outstanding examples remain few, which sets these designated blades apart within the lineage. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Terushige照重 | 1558-1570 | 2 |
| Terushige照重 | 1596-1615 | 1 |
| Yasushige康重 | 1558-1570 | 1 |
| Morishige盛重 | 1661-1673 | 0 |
| Yasushige康重 | 1661-1704 | 0 |
The Muromachi period (1392 to 1573)
After the Ōnin War broke the Ashikaga order, a century of Sengoku warfare armed nearly every province in Japan. The era rewards a discriminating eye: routine work exists in quantity, and beside it stand custom blades of the first rank.
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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