NihontoWatchNihontoWatch大振りで土手耳にしたてられ、透かしの隙間に繋ぎ合わせからなる甲冑師の妙技が示された作。鉄色黒く、陰に透かされた大根が鐔面にすっきりと浮かび上がる構成も面白い。造り込みはは環状の耳を平地と鍛着したものであろう、切羽台に比較して土手耳の際が僅かに薄手とされており、打ち込まれた相手の力を吸収するためのこの構造にも緊張感が窺える。指先で弾くとカランと乾いたように古調に響き、素材も造り込みも味わいが格別。 特別保存刀装具（古甲冑師）
NihontoWatchOffered by Choshuya
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Ko-Katchushi School
Pre-Edo
Unsigned
Tokuho (NBTHK)
As written by the shop
Tosho-Katchushi
22 pieces on the market now
The Ko-Katchūshi tradition emerged during the Nanbokuchō and Muromachi periods as armorers (katchūshi) began producing sword guards as an auxiliary craft alongside their primary occupation of armor fabrication. As the uchigatana evolved from a purely utilitarian weapon into an object of aesthetic appreciation, craftsmen who had honed their metalworking skills in forging helmet plates, the small scales (kozane) of armor, and face defenses (menpō) applied this expertise to tsuba production. These guards served not merely as practical implements but as expressions of the religious devotion and cultivated sensibilities of Sengoku-period warriors, who lived amid the uncertainties of constant warfare. Ko-Katchūshi works exhibit a distinctive technical and aesthetic vocabulary characterized by large, round forms executed in well-forged iron with relatively thin plates and deliberately thickened edges. The signature dote-mimi (raised "embankment" rim) or okesoko-mimi ("bucket-bottom" rim) provides structural strength while framing designs rendered in kage-sukashi (shadow openwork) against hammered (tsuchime-ji) or stone-textured (ishime-ji) grounds. The openwork motifs range from Buddhist invocations such as the six-character Namu Amida Butsu to auspicious symbols including chrysanthemums, the omodaka ("victory plant"), and sacred implements like the gorintō stupa, reflecting the spiritual concerns of their warrior patrons.
The iron surfaces, unadorned by inlay (zōgan), develop deep patinas that harmonize with remnants of black lacquer finish, creating an austere yet refined elegance. The Ko-Katchūshi aesthetic represents a foundational moment in tsuba history, establishing the principle that functional metalwork could embody both martial strength and contemplative beauty. These guards convey a paradoxical quality—rustic simplicity coexisting with cultivated taste, robust construction balanced by delicate openwork that lends lightness to imposing scale. The deeply settled iron oxidation and vigorous expression of forms powerfully evoke the resolute spirit and religious faith of medieval warriors while demonstrating the ineffable refined charm distinctive to early armor-makers' work. This tradition provided essential groundwork for later schools that would further develop the tsuba as an independent art form. Learn more →
A Hozon-certified fitting of notably superior craftsmanship and condition, often with signature or workmanship of high reference value.
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 siteIf, due to our fault, the item differs significantly from its proper condition, the item may be returned. Cooling-off is within one week of the item's arrival.