NihontoWatchNihontoWatchSakura-gawa-Sukashi Tsuba 堅丸形 鉄磨地 地透 毛彫 丸耳 In paulownia wood box
NihontoWatchOffered by World Seiyudo
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Iron-tsuba · Musashi · around 1704-1764
6 pieces on the market now
Iron-tsuba · Edo
Phase: Akasaka赤坂· 1688–1860
59 pieces on the market now
| Smith | Era | Designated |
|---|---|---|
| Tadamasa忠正 | 1624-1657 | 5 |
| Tadashige忠重 | 1730-1816 | 5 |
| Tadatoki忠時 | 1704-1764 | 0 |
| Juchiku/Toshitake寿竹 | — | 0 |
| Tadanori忠則 | 1730-1780 | 0 |
Certifies a genuine fitting worth preserving: a correct signature, or, if unsigned, an identifiable era and school, with recognized artistic and craft 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 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).