Kantei
Whole katana blade, curved, with an engraving at the base and the signed tang, on a black background.

Dewa and Edo · end of the Edo · shinshintō

Suishinshi Masahide (水心子正秀)

The Dewa swordsmith who took the sword back to Kamakura: his life in Edo, his books, his style, his works and his sources

Suishinshi Masahide (水心子正秀) was born in Dewa in 1750 and was swordsmith to the Akimoto house in Edo. In his books he championed the return to the swords of the Kamakura and the Nanbokuchō, he had many pupils and he is held to be the initiator of shinshintō.

Tokyo National Museum, via ColBase

1750-1825
Birth and death
1777-1819
Dated works
4 in the 2025 exhibition
NBTHK Jūyō Tōken
5 books
Treatises
On this page
  1. Quick profile
  2. In short

Quick profile

Name
Suishinshi Masahide AT
Kanji and reading
水心子正秀 (Suishinshi Masahide), as signed on the katana of 1808 in the Tokyo National Museum HD
Period
End of the Edo period (shinshintō) AT
Province
Born in Dewa (出羽), on Yonezawa land; worked in Edo AT
School
Swordsmith to the Akimoto (秋元) house, lords of Yamagata; initiator of the return to the old ways AT
Master
Shitahara Yoshihide (下原吉英), in Hachiōji, from 1771 AT
Title
No honorary title is recorded. From 1818 he signed 天秀 (Tenshū), which Kotobank reads Amahide. PC
Generations
He was followed by his son, the second, and the one called the fourth; Masatsugu (正次), adopted son of the second, did not inherit the name AT
Rank
One of the three great swordsmiths of Edo (江戸三作, Edo sansaku), with Taikei Naotane and Minamoto Kiyomaro, as the NBTHK brought them together in its 2025 exhibition HD
Documented fact and tradition
Documented: three blades of his and his Tōken bengi (刀劔弁疑) in the Tokyo National Museum, and four Jūyō Tōken in the NBTHK exhibition of 2025. Tradition: he is held to be the initiator of shinshintō, and he is said to have trained more than a hundred swordsmiths. HD

In short

He began by making blades in the Ōsaka manner, with the tōran-ba of Tsuda Sukehiro, and then, convinced that the sword had to return to that of the Kamakura and the Nanbokuchō, he worked in the Bizen and Sagami traditions and published his methods, until then secret. In 2025, the bicentenary of his death, the NBTHK devoted to him, with Naotane and Kiyomaro, the exhibition “Three Excellent Swordsmiths” at the Japanese Sword Museum in Tokyo.

Sections

  1. From Dewa to Edo Life and times Dewa, his apprenticeship, the Akimoto, his books, his pupils and his successors.
  2. From the tōran-ba to the return to the old ways Work and style His evolution, the kantei keys and how to tell him from Sukehiro.
  3. Museums, Jūyō Tōken and the bicentenary Famous works His blades in museums and shrines, his Jūyō Tōken and his books.
  4. The bicentenary and his homeland Videos The bicentenary exhibition and a documentary about his life.
  5. Bibliography and credits Sources The sources consulted on 5 October 2026, with their link, and the credit for each image.