SEKISHU NAOTSUNA has been considered to be a pupil of Masamune.
When Masamune, Norishige and Yukimitsu completed the top achievements of the Soshu tradition, the style of sword making that came out of their forge in Kamakura swept through Japan. Smiths from other provinces came to train in Kamakura according to old books and then took what they learned back to their home province. Shizu is said to come from the Tegai school in Yamato, moved to Kamakura to study under Masamune, then later moved to Mino and became the founder of the Mino tradition. Samonji is said to have come from Chikuzen to study Soshu techniques, and there is a sharp difference between the blades of his youth in the traditional Chikuzen style vs. these he learned after being in Kamakura
SEKISHU NAOTSUNA's craftsmanship produced a dark iron hue in the ji. Both ji and ha are admirably nie-structured. The hamon is gunome mixed with ko-notare and choji-gokoro variations, creating florid midare accompanying a lot of sunagashi. This almost forms hitatsura-gokoro in places and indicates its having its root in the Soshu tradition.
Naotsuna is a line of smiths from Iwami province and the founder of this line has been included amongst the Masamune Juttetsu in books since the Muromachi period.
About this sword: Attributed to Sekishu Naotsuna
period: End Kamakura / Beginning Nanbokucho (ca. 1334)
designation: NBTHK Juyo Token
nakago: o-suriage mumei
nakago nagasa: 19.2cm
nakago sori: 0.2cm