This sword was formed in the Edo era by a swordmaker 信房 (Nobufusa).
He was one of the swordmakers of Fukuoka Ichimonji style.
This is a Japanese sword designated as a national treasure of Japan.
Feudal lord Sakai Tadatsugu of the Shonai feudal clan (Yamagata Pref) was given this sword in 1584 by general Tokugawa Ieyasu by the outstanding job of the war of Komaki-Nagakute .
The name of this beautiful Japanese sword is Nobufusa: Tsuketari Itomaki Tachi Koshirae.
This photo is presented by Chido Museum in Tsuruoka of Yamagata Pref.