Katana in Shirasaya, with Koshirae. （NBTHK Hozon Paper)
Signature: Oite Toto Ushuu Yonezawa omi Katou Tsunatoshi
Doyou no shi Kitahara Naosuga Aizuchi Kitae motte Aidzuchi Kitae kore
The blade was polished
Habaki: Gold foiled single habaki
Blade length : 69.24cm or 27.27inches.
Sori : 1.8cm or 0.7inches.
Mekugi : 1
Width at the hamachi : 2.9cm or 1.14inches.
Width at the Kissaki : 2.16cm or 0.85inches.
Kasane : 0.8cm or 0.32inches.
Era : Late Edo period
Shape : It is wide and thick katana with deep sori.
Jitetsu : Koitame hada well grained with jinie attached. It is plain style clear jigane.
Hamon : The hamon close to the tang is suguha, however it becomes douranba style with deep nioiguchi.
Special feature : Katou Tsunatoshi was called Katou Hachirou.
He was born as the second son of Katou Sukejirou Kunihide at Dewa country
Yonezawa(Now Yamagata and Akita province, North east Japan. ).
Later on he becomes Chouunsai. His older brother was Katou Tsunahide
and was feudal load of Dewa Yonezawa. At the first year of Bunsei（1818)
he and his brother has moved to Edo and learned the forging skills
from Suishinshi Masahide. Later on, he traveled through Kumamoto
and has taught many students. He was especially had interacted
with Shouruuken Moritoshi and received the second generation.
Since Tsunahide was expert of Douranba, Tsunatoshi has learned
completely the Douranba skills from Tsunahide. This sword is similar to
that of Akama Tsunanobu, the student of Tsunahide.
It is also similar to Osaki Minamoto Gorozaemon Suketaka’s douranba piece.
It is excellent piece.
His work is Konie base Chouji ba with unique charscteristic.
It is similar to that of Koyama Munetsugu too.
This sword is made with Kitahara Naosuga(Gassakutou).
Tsuba : Round shape iron tsuba
Fuchikashira : Silver
Saya : Black roiro saya
Menuki : Shakudou base with boat and turret engraved.
NBTHK Hozon Paper
Aoi Art estimation paper : whole Oshigata.