Ikoma Mitsutada

Ikoma Mitsutada is a katana attributed to Osafune Mitsutada, the master smith active in Bizen Province during the middle Kamakura period. Its formal designation is "Katana, gold-inlay attribution signature Mitsutada, kao of Mitsutoku, owned by Ikoma Sanuki-no-kami," and it was designated a National Treasure on February 2, 1955. It is held by the Eisei Bunko Foundation in Bunkyo, Tokyo.

Mitsutada is regarded as the effective founder of the Osafune school and one of the defining smiths of Kamakura-period Bizen, celebrated for perfecting the flamboyant choji-midare hamon. The blade is shortened (o-suriage) and has lost its original signature, but Hon'ami Mitsutoku appraised it as Mitsutada's work and recorded that attribution as a gold-inlaid inscription on the tang, thought from his handwriting to date to the end of the Keicho era (1610s).

The sword takes its name from Ikoma Chikamasa, the Sanuki-no-kami daimyo who served Toyotomi Hideyoshi and ruled Sanuki Province. In 1900 it was purchased by Marquis Hosokawa Moritatsu, the 16th-generation Hosokawa head who later founded the Eisei Bunko; it is said to have been the very first sword he acquired, purchased with advanced pocket money, making it the cornerstone of his collection.

The blade is broad and imposing, with a finely packed ko-itame jihada bearing ji-nie and the vivid midare-utsuri characteristic of Bizen work. The hamon is a brilliant choji-midare with kawazo-choji and juka-choji, lively ashi and yo, and a bright nioi-guchi, the boshi ending in a small ko-maru return. Even unsigned, its quality fully justifies its National Treasure status, and its transmission through the Ikoma and Hosokawa houses makes it one of the representative works conveying Mitsutada's flamboyant style.