NihontoWatchNihontoWatchKabuto-zu Kozuka Kougai Menuki 赤銅魚子地 高彫 色絵 赤銅地 容彫 色絵 In paulownia wood box
Certificate reading — 無銘（京金工）
NihontoWatchKyo-kinko School京金工派
Offered by World Seiyudo
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Kyo-kinko School
Edo
Unsigned
Hozon (NBTHK)
Kinko · Yamashiro
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.
NBTHK official siteNo cooling-off period or returns; refund only if the purchased sword is proven fake, capped at purchase price (excludes commission sales, accessories, auction items).