This is a beautiful kozuka attributed by the NBTHK to the Yoshioka school of the Edo period (late 17th century). It features a shakudo nanako background with three mirrors, two in elaborately decorated gold and a central one in shibuichi. A book, Gotô Ke Kozuka Sensû, attributes this kozuka to the Gotô school, specifically to the 10th generation mainline master Gotô Renjô.
Certificate reading — 無銘(吉岡)





Yoshioka School
Kotō
Koto
Hozon (NBTHK)
Iebori
15 pieces on the market now
The Yoshioka family (Yoshioka-ke) was an authoritative lineage of metalworkers retained by the Tokugawa shogunate, granted a stipend of one hundred hyo (bales of rice) and rations for ten persons. The house was founded by the first-generation master Shigetsugu, who was summoned into service by Tokugawa Ieyasu during the Keicho era (1596--1615), and it flourished continuously through nine generations down to Shigesada at the close of the shogunate. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Inaba no Suke因幡介 | 1670 | 6 |
| Terutsugu照次 | 1670 | 2 |
| Shigesada重貞 | — | 0 |
| Kiyotsugu清次 | — | 0 |
| Morotsugu師次 | — | 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 siteThree-day inspection period and seven-day return period; buyer notifies by email within three days of receipt, no reason needed; full refund once item returned undamaged and unaltered.
This is a beautiful kozuka attributed by the NBTHK to the Yoshioka school of the Edo period (late 17th century). It features a shakudo nanako background with three mirrors, two in elaborately decorated gold and a central one in shibuichi. A book, Gotô Ke Kozuka Sensû, attributes this kozuka to the Gotô school, specifically to the 10th generation mainline master Gotô Renjô.
Certificate reading — 無銘(吉岡)





Yoshioka School
Kotō
Koto
Hozon (NBTHK)
Iebori
15 pieces on the market now
The Yoshioka family (Yoshioka-ke) was an authoritative lineage of metalworkers retained by the Tokugawa shogunate, granted a stipend of one hundred hyo (bales of rice) and rations for ten persons. The house was founded by the first-generation master Shigetsugu, who was summoned into service by Tokugawa Ieyasu during the Keicho era (1596--1615), and it flourished continuously through nine generations down to Shigesada at the close of the shogunate. Learn more →
| Smith | Era | Designated |
|---|---|---|
| Inaba no Suke因幡介 | 1670 | 6 |
| Terutsugu照次 | 1670 | 2 |
| Shigesada重貞 | — | 0 |
| Kiyotsugu清次 | — | 0 |
| Morotsugu師次 | — | 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 siteThree-day inspection period and seven-day return period; buyer notifies by email within three days of receipt, no reason needed; full refund once item returned undamaged and unaltered.