Katana in Shirasaya with Koshirae(29th NBTHK Juyo Paper)
The blade was polished by good polisher.
Habaki:Gold foiled double habaki.
Blade length : 68.78 cm or 27.07 inches.
Sori : 1.2 cm or 0.47 inches.
Width at the hamachi : 2.87 cm or 1.12 inches.
Width at the Kissaki : 2.02 cm or 0.79 inches.
Kasane : 0.6 cm or 0.23 inches.
Era : Late Kamakura to Nanbokucho period.１３３６.
Shape : The blade is Oosuriage mumei (cut shortened) wide and thick healthy blade.
Jitetsu :Itame hada and ooitame hada convined with jinie attach and also Chikei work.
Hamon : Niedeki suguha based with thick nioikuchi and in Ha, there are many sunagshi and kinsuji acatter and also Yo work.
Special feature : Kouda school started by Konyudo Kunimitsu and continued to Nanbokucho period by Kunifusa, Kunimune and Kunitomo.
After that this Uda school continued to late Muromachi period.
This group was working at Toyama prefecture Mikkaichiuda.
At a glance, the blade looks like Echu Norishige, because of the active blackish itame hada and hataraki of the hamon.
Tsuba：Round shape iron Tsuba, plants engraved with brass inlay. Heianjo Tsuba.
Fuchikashira: Iron, arabesque is engraved with gokd color. Higo.
Saya: Kawari Nuri red color Saya.
Menuki: Horsetail is engraved.
Kogai: Shakudo Nanako, phoenix and flower are engraved with gold color.
Historical background: Tenno Godaigo moved to Yoshino.(the beginning of the Nancho government).
Shogun Ashikaga Takauji establish the government at Kyoto area.
After the Kamakura period, 2 groups devised government.
29th NBTHK Juyo Paper
Aoi Art estimation paper : whole Oshigata.
Price : 1,900,000 JPY