Katana in Shirasaya (NBTHK Tokubetsu Hozon Token)
Signature : Ecchu Kami Fujiwara Takahira(the 1st generation)
(Kiritsuke Mei) Ansei 8nen 10gatsu 11nichi
Kozukahara Nini Mitodoke Ishiguro Kojuro
Chusya Dotan Barai Kitte Yamada Asaemon
(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku)
Shinto: Jyojyosaku: Ryowazamono: Kaga
This sword belongs to Saijyo Saku ranking.
The blade was polished.
Habaki : Gold single Kasyu habaki.
Blade length : 69.5 cm or 27.36 inches.
Sori :1.1cm or 0.43 inches.
Mekugi : 2
Width at the hamachi : 2.96cm or 1.17 inches.
Width at the Kissaki : 2.1 cm or 0.83 inches.
Kasane :0.58 cm or 0.23 inches.
The weight of the sword 710 grams.
Era : early Edo period Genna era
Shape : The blade is wide and thick with suitable sori.
It is typical shape of katana around early Edo period.
Jigane : Koitamehada well grained.
Hamon : Niedeki gunome midaire with deep nioikuchi. It is hako-midare.
There are fine Kinsuji and Sunagashi in the blade. Boshi turns back roundly. It looks like ichimai Boshi.
Special feature: Ecchu kami Fujiwara Takahira is Jinroku kanewaka.
He succeeded his father Yomosuke Kanematsu around 1610,
and was appointed to a lord of Ecchu. Kanewaka is said to have been descended
from Shizu, so his early work are similar to Shizu.
later, He changed his style and established Kaga Shinto.
This sword has Saidanmei. Saidanmei says that Yamada Asaemon
tested sharpness in Kozukappara.
There is the Kozukappara execution grounds there.
In Kozukappara, dissection and trill cutting were performed
us using sinner’s corpse.
From Aoi-Art: The jigane and Hako-midare is wonderful,
so I evaluate as Saijyo saku.
NBTHK Tokubetsu Hozon Token
Aoi Art estimation paper: whole Oshigata.