This is a tanto signed Gassan from the Dewa province, dating back to the Tenbun era (1532-1554) of the late Muromachi period. It features an Ayasugi hada and comes with a koshirae and shirasaya. The blade has a distinctive two-character signature.














Wakimono · Dewa
49 pieces on the market now
Mount Gassan rises among the Dewa Sanzan, the three sacred peaks of northern Japan bound to the mountain asceticism of Shugendō, and the swordsmiths who took the mountain's name worked in its shadow in Ōshū, Dewa Province. The setsumei record that smiths signing "Gassan" are noted in the Kanchiin-bon Meizukushi as early as the Heian period, and the lineage's oldest surviving signed blade is a tachi simply signed Gassan, kept at the Gassan Shrine and judged to date from the late Nanbokuchō to early Muromachi period. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Naonori直則 | 1830-1844 | 0 |
| Toshiyasu俊安 | 1504-1521 | 0 |
| Nagahisa長久 | 1334-1338 | 0 |
| Kiyoyasu清安 | 1532-1555 | 0 |
| Tomosada友定 | 1532-1555 | 0 |
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 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.
This is a tanto signed Gassan from the Dewa province, dating back to the Tenbun era (1532-1554) of the late Muromachi period. It features an Ayasugi hada and comes with a koshirae and shirasaya. The blade has a distinctive two-character signature.














Wakimono · Dewa
49 pieces on the market now
Mount Gassan rises among the Dewa Sanzan, the three sacred peaks of northern Japan bound to the mountain asceticism of Shugendō, and the swordsmiths who took the mountain's name worked in its shadow in Ōshū, Dewa Province. The setsumei record that smiths signing "Gassan" are noted in the Kanchiin-bon Meizukushi as early as the Heian period, and the lineage's oldest surviving signed blade is a tachi simply signed Gassan, kept at the Gassan Shrine and judged to date from the late Nanbokuchō to early Muromachi period. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Naonori直則 | 1830-1844 | 0 |
| Toshiyasu俊安 | 1504-1521 | 0 |
| Nagahisa長久 | 1334-1338 | 0 |
| Kiyoyasu清安 | 1532-1555 | 0 |
| Tomosada友定 | 1532-1555 | 0 |
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 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.