Ryujin Swords

Chisa-katana by Osaka Ishido school in shirasaya, NTHK

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Period: Edo period, Kanbun era (circa 1661).

Mei: Mumei.

Sugata: Shinogi-zukuri, shallow tori-zori, iori-mune.

Overall length: 28.50 inches (723.90 mm).

Nagasa: 22.50 inches (571.50 mm).

Nakago: Ubu, 6.00 inches (152.40 mm), katte sagari yasurimei and iriyama gata nakago-jiri.

Kissaki: Chu-kissaki, 1.26 inches (32.00 mm). Ko-maru boshi.

Moto-haba: 1.20 inches (30.50 mm). Saki-haba: 0.77 inches (19.50 mm). Moto-gasane: 0.23 inches (5.90 mm). Saki-gasane: 0.16 inches (4.00 mm).

Sori: 0.47 inches (12.00 mm).

Hamon: A flamboyant gunome choji midare, ko-nie-deki, kinsuji, and sunagashi.

Hada: Mokume hada, with some running masame, plus utsuri and chikei in jitetsu.

Blade condition: In old but excellent 100% polish and excellent condition. I don't think that this needs repolishing. No ware or fatal flaws.


Comes with a shirasaya and a good quality gilt double habaki.


A superb sword in flawless condition with plenty of activity in the blade. One I'm tempted to keep for myself.

The Ishido school were a group of smiths in Omi province who were said to be the descendants of the Ichimonji school of Bizen province, in whose style they worked. They were one of the rare schools producing utsuri during the Shinto period. During the Kanei era (1624-1644) the group moved first to Wakayama and later to Osaka. The school includes smiths such as Kawachi no Kami Yasunaga and Bizen no Kami Sukekuni. Tatara Nagayuki, one of the finest smiths of the Shinto period, was Yasunaga’s student. Some smiths (e.g. Nagayuki) produced katana with relatively short nagasa.