The blade was polished.
Blade length : 50.0 cm or 19.68 inches.
Sori : 0.9 cm or 0.35 inches.
Mekugi : 2
Width at the hamachi : 3.28 cm or 1.29 inches.
Width at the Kissaki : 2.33 cm or 0.91 inches.
Kasane : 0.73 cm or 0.28 inches.
Era : Edo period, circa Kan-ei era. 17th century.
Shape : An imposing shinogi-zukuri katana, plenty of flesh in the right places.
Jitetsu : Jinie and chikei appear on the fine ko-itame.
There is a small kitaeware in the Ha around monouchi area but not so bad.
Hamon : Nie deck Gunome midair and Kogunome midair mixed with jinie attach active deep nioikuchi and in Ha, many ash, sunagashi and also kunsuji scatter.
Special feature : Kunitsugu, born in Higo province went to Kyoto and learned under Dewa Daijo Fujiwara Kunimichi in Yamashiro province.
It is thought that they worked together for a long period of time and several collaborations still survive.
Kunitsugu's signed pieces are comparatively rare. According to the inscription on the revere side of the tang, he forged this katana by imported iron at that time.
This is the most magnificent and excellent Kunitsugu's sword we have ever seen.
NBTHK Hozon Paper
Aoi Art estimation paper : whole Oshigata.