This katana is signed by Nagaguchi Sadaharu, a student of Gassan Sadakichi, and was made in 1865 during the late Edo period. It features a robust form with a wide moto-haba and saki-haba, a large kissaki, and a modest sori, reflecting the turbulent times of the Bakumatsu period. The blade has a thick kasane for durability and a well-balanced construction with bo-hi, housed in a shirasaya with a gold foil double habaki. It is certified as Tokubetsu Hozon.
mei · Gassan · Shin-shinto · nagasa 68.5cm · sori 1.4cm










Shinshinto · Settsu · around 1865-1868
Tōken Taikan top 95%
5 pieces on the market now
Shinshinto · Settsu
40 pieces on the market now
| Smith | Era | Designated |
|---|---|---|
| Sadaharu貞晴 | 1865-1868 | 0 |
| Sadayoshi貞吉 | 1926-1989 | 0 |
| Yoshiaki吉明 | 1844-1848 | 0 |
| Naonobu直信 | 1854-1860 | 0 |
| Sadayoshi貞吉 | 1830-1863 | 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 katana is signed by Nagaguchi Sadaharu, a student of Gassan Sadakichi, and was made in 1865 during the late Edo period. It features a robust form with a wide moto-haba and saki-haba, a large kissaki, and a modest sori, reflecting the turbulent times of the Bakumatsu period. The blade has a thick kasane for durability and a well-balanced construction with bo-hi, housed in a shirasaya with a gold foil double habaki. It is certified as Tokubetsu Hozon.
mei · Gassan · Shin-shinto · nagasa 68.5cm · sori 1.4cm










Shinshinto · Settsu · around 1865-1868
Tōken Taikan top 95%
5 pieces on the market now
Shinshinto · Settsu
40 pieces on the market now
| Smith | Era | Designated |
|---|---|---|
| Sadaharu貞晴 | 1865-1868 | 0 |
| Sadayoshi貞吉 | 1926-1989 | 0 |
| Yoshiaki吉明 | 1844-1848 | 0 |
| Naonobu直信 | 1854-1860 | 0 |
| Sadayoshi貞吉 | 1830-1863 | 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.
