Bibliography and credits

Sources

The sources consulted on 4 October 2026, by type, and the credit for each image. Only sources that do not sell swords are linked; those that do sell served to learn about the tradition, but they are neither cited nor linked.

On this page
  1. Sources

Sources

NBTHK

  1. NBTHK, the association's journal, issue 779 (December 2021), English translation: Sadaoki's tachi and the Hōshō school

Studies

  1. Markus Sesko, “Kantei 2 – Jigane/Jihada 2” (2015)

Encyclopaedias

  1. Japanese Wikipedia: 五箇伝 (gokaden)

Official databases and museums

  1. Bunka Isan Online: the tantō 大保昌 (Ōhōshō)
  2. Bunka Isan Online: search by artist 貞宗 (Sadamune)
  3. ColBase: Tokyo National Museum, F-20112
  4. e-Museum: the tantō 大保昌 (Ōhōshō), signed by 藤原貞吉 (Fujiwara Sadayoshi)
  5. Wikimedia Commons: the tantō Kuwayama Hōshō

Image credits

  1. The tantō 大保昌 (Ōhōshō), by Sadayoshi, another smith of the school, in the Tokyo National Museum: one side, with its bōhi. (ohosho-omote.jpg)

    Tokyo National Museum, via ColBase · ColBase terms of use.

  2. The Ōhōshō, the other side: the masame of the school and the tang ending in kiri. (ohosho-ura.jpg)

    Tokyo National Museum, via ColBase · ColBase terms of use.

  3. The Ōhōshō on display with its habaki. (ohosho-exposicion.jpg)

    Kakidai, via Wikimedia Commons · CC BY-SA 3.0.

  4. The tantō 桑山保昌 (Kuwayama Hōshō), by Sadayoshi, in a 1938 photo: one side. (kuwayama-hosho-1.jpg)

    Tokyo Imperial Museum, 1938, National Diet Library, via Wikimedia Commons · Public domain.

  5. The Kuwayama Hōshō, the other side, with the signature on the tang. (kuwayama-hosho-2.jpg)

    Tokyo Imperial Museum, 1938, National Diet Library, via Wikimedia Commons · Public domain.