This is a tanto by Sukesada from the Osafune school in Bizen province, dated to the 4th year of Tensho (1576). It comes with a decorative lacquered saya and a shirasaya. The blade is certified Hozon by the NBTHK.
Certificate reading — 銘 備州長船祐定 天正二年八月日
mei · Osafune · Tensho (1573-1592) · nagasa 23.4cm



Bizen-den · Bizen · around 1573-1592
Tōken Taikan top 39%
8 pieces on the market now
Where Sukesada stands among comparable artisans: across all of nihontō, and within tradition, era, and period. The tiers (Foremost · Leading · Major · Notable) weigh official designations from the NBTHK and Japan's Agency for Cultural Affairs, together with historical honors of lasting repute such as the Sansaku and Meibutsu-chō.
Select a lens to see how it's measured.
Years he was demonstrably active, proven by signed-and-dated blades
Bizen-den · Bizen
Phase: Sue-Bizen末備前· 1441–1596
71 pieces on the market now
The last great chapter of Osafune unfolds in the Eisho and Tenbun years of the late Muromachi, when the riverside workshop turned its accumulated craft toward an age of constant war. Where Oei-Bizen had looked backward, reviving the tachi shape and the choji temper of the Kamakura masters under Yasumitsu and Morimitsu, Sue-Bizen faces forward into Sengoku demand. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Sukesada祐定 | 1504-1551 | 72 |
| Sukesada祐定 | 1532-1583 | 18 |
| Sukesada祐定 | 1547-1592 | 8 |
| Sukesada祐定 | 1487-1521 | 5 |
| Sukesada祐定 | 1532-1573 | 3 |
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 siteCooling-off (returns or exchanges) is accepted within 3 days of the item's arrival. Return shipping and refund transfer fees are the customer's responsibility. Fees other than the item price (transfer fees, credit card fees, etc.) cannot be refunded. Returns and refunds are not available for overseas destinations.
This is a tanto by Sukesada from the Osafune school in Bizen province, dated to the 4th year of Tensho (1576). It comes with a decorative lacquered saya and a shirasaya. The blade is certified Hozon by the NBTHK.
Certificate reading — 銘 備州長船祐定 天正二年八月日
mei · Osafune · Tensho (1573-1592) · nagasa 23.4cm



Bizen-den · Bizen · around 1573-1592
Tōken Taikan top 39%
8 pieces on the market now
Where Sukesada stands among comparable artisans: across all of nihontō, and within tradition, era, and period. The tiers (Foremost · Leading · Major · Notable) weigh official designations from the NBTHK and Japan's Agency for Cultural Affairs, together with historical honors of lasting repute such as the Sansaku and Meibutsu-chō.
Select a lens to see how it's measured.
Years he was demonstrably active, proven by signed-and-dated blades
Bizen-den · Bizen
Phase: Sue-Bizen末備前· 1441–1596
71 pieces on the market now
The last great chapter of Osafune unfolds in the Eisho and Tenbun years of the late Muromachi, when the riverside workshop turned its accumulated craft toward an age of constant war. Where Oei-Bizen had looked backward, reviving the tachi shape and the choji temper of the Kamakura masters under Yasumitsu and Morimitsu, Sue-Bizen faces forward into Sengoku demand. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Sukesada祐定 | 1504-1551 | 72 |
| Sukesada祐定 | 1532-1583 | 18 |
| Sukesada祐定 | 1547-1592 | 8 |
| Sukesada祐定 | 1487-1521 | 5 |
| Sukesada祐定 | 1532-1573 | 3 |
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 siteCooling-off (returns or exchanges) is accepted within 3 days of the item's arrival. Return shipping and refund transfer fees are the customer's responsibility. Fees other than the item price (transfer fees, credit card fees, etc.) cannot be refunded. Returns and refunds are not available for overseas destinations.