The NTHK-NPO has attributed this long wakizashi specifically to the Nidai Masahiro who worked in the Kanbun era c. 1661-1673. The nakago is ubu. Bo-hi are cut bilaterally and are superbly done. The hamon is midare based on notare and contain a multitude of hataraki.

Courtesy of Seskos, Swordsmiths A-Z:

MASAHIRO (正広), 2nd gen., Kanbun (寛文, 1661-1673), Hizen – “Hizen no Kuni Masanaga” (肥前国正永), “Hizen-jū Musashi no Kami Fujiwara Masanaga” (肥前住武蔵守藤原正永), “Hishū Saga-jū Fujiwara Masahiro” (肥州佐賀住藤原正広), “Hizen no Kuni Kawachi no Kami Fujiwara Masahiro” (肥前国河内守藤原正広), real name Hashimoto Yashichirō (橋本弥七郎), he also bore the first name Sadenjirō (左伝次郎), son of the 1^st gen. Masahiro (正広), he received the honorary title Musashi no Daijō on the 19th say of the tenth month Manji three (万治, 1660), this title was raised to Musashi no Kami on the 28th day of the ninth month Kanbun one (1661) but was changed on the 13th day of the fourth month Kanbun five (1665) to Kawachi no Kami, with this he changed his name from Masanaga (正永) that he had used so far to Masahiro (正広), he died on the sixth day of the eighth month Genroku twelve (元禄, 1699) at the age of 73, suguha, notare mixed with ko-gunome-ashi, gunome-midare, sometimes also picturesque hamon, wakizashi are mostly signed with the prefix “Hishū” (肥州) instead of “Hizen,” jō-saku.

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