Ryujin Swords

Koto period Sue-Mihara tanto by Masamune in aikuchi koshirae

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Period: circa 1469.

Mei: Mihara Masamune saku.

Sugata: Unokubi-zukuri based on hira-zukuri, shallo koshi-zori, with bo-hi.

Overall length: 17.24 inches (438.00 mm).

Nagasa: 12.52 inches (318.00 mm).

Nakago: Ubu, 4.72 inches (120.00 mm). Kuri-jiri nakago-jiri, three mekugi-ana.

Kissaki: No kissaki. Ko-maru boshi with deep kaeri and waterfall.

Moto-haba: 1.12 inches (28.40 mm). Moto-gasane: 0.28 inches (7.00 mm).

Sori: 0.27 inches (6.9 mm).

Hamon: Midare, leading into gunome.

Hada: Ko-mokume hada.

Blade condition: Excellent - freshly polished with no flaws.


The Edo period aikuchi koshirae are in excellent condition and feature a Buddhist cross (manji) mon. The kurikata is at least gilded.


The Mihara School was founded by Masaiye in Bingo Province around the Shochu era (1324 - 1326) of the late Kamakura period, and 'Masa' remained a common element in the names of the Mihara smiths. The schools lasted through into the Shinto period.

The Sue-Mihara, according to Robinson, were from 1350 to 1450; Hawley lists them from 1350-1500. Hawley list five Mihara smiths using the name Masamune. This blade however is probably the work of the third generation (MAS579, 20 points) who was working around 1469.

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