Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
This is an unsigned katana attributed to the Sue-Seki school. It features a shino-zukuri, iori-mune construction with a fine ko-nuka hada and a large gunome-midare hamon. The blade is in excellent condition, freshly polished with no rust or chips, and comes with a koshirae including a silver habaki with a hikitryo mon, a black ishime saya, and a round copper tsuba with fukurin.
mumei · Sue-Seki · Muromachi · nagasa 69.8cm · sori 2cm

Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
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 site
This is an unsigned katana attributed to the Sue-Seki school. It features a shino-zukuri, iori-mune construction with a fine ko-nuka hada and a large gunome-midare hamon. The blade is in excellent condition, freshly polished with no rust or chips, and comes with a koshirae including a silver habaki with a hikitryo mon, a black ishime saya, and a round copper tsuba with fukurin.
mumei · Sue-Seki · Muromachi · nagasa 69.8cm · sori 2cm

Muromachi turned sword making into an industry: the uchigatana rose with massed infantry warfare, Osafune and Seki produced bundle swords beside custom orders, and the Ming trade carried Japanese blades abroad by the tens of thousands.
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 site