Osafune Kanemitsu

Kanemitsu was a representative swordsmith of the Ōsafune school in Bizen Province during the Nanboku-chō period. His grandfather was Nagamitsu, and he is said to have been the son of Kagekō. He held the title Saemonojō and is also called "Enbun Kanemitsu" because his activity centered on the Enbun era (1356–1361). Traditionally, scholars have posited separate generations (first and second) based on changes in style, but the prevailing modern view is that a single smith broadened his working range over the course of his career. His dated works concentrate in the flourishing period of the Nanboku-chō era, making him a celebrated master embodying the peak prosperity of Ōsafune craftsmen.

His style underwent significant transformation throughout his career. In his early period, he forged one-sided gunome with emphasis on nioi inherited from his father Kagekō, and chōji-ba continuing from his grandfather Nagamitsu; the hamon at the kissaki returns in small maru form, exemplifying a restrained style. From around the Enbun era onward, his working range transformed dramatically toward what is called "Sōden-Bizen"—a forceful style where both jigane and blade exhibit nie-work, integrating the nie activity of the Sōshū tradition into the Bizen idiom. His hamon intermingled notare with gunome, forging magnificent large tachi exceeding three shaku. The jigane displays a distinctive utsuri called "peony reflection," and not a few of his blades bear sculptural ornament. Many large tachi from the Nanboku-chō period were subsequently remounted with heavy polishing and converted to katana.

All extant representative works are designated as Important Cultural Properties; no signed work designated as a National Treasure has been identified. Among these, the "Fukushima Kanemitsu," housed in the Tokyo National Museum and transmitted as the sword worn by Fukushima Masanori, is a renowned blade recorded in the Kyōhō Meibutsuchō. The "Ikkoku Kanemitsu" is a tachi bearing the date Bun'wa 4 (1355), named from a Tosa Domain anecdote that it is "worth a province," and is transmitted at the Kōchi Castle Historical Museum in Kōchi Prefecture. The "Dai Kanemitsu" is known for its exceptional length; it passed through the hands of Toyotomi Hideyoshi and others, was subsequently remounted with heavy polishing, and received a gold-inlaid signature by Honʻami Mitsutsuyu. It is a renowned blade recorded in the Kyōhō Meibutsuchō and is currently housed in the Sano Art Museum. The Uesugi family possesses a transmission of large tachi from the Enbun era; all extant examples are designated as Important Cultural Properties.

Among contemporary Ōsafune masters were Norimitsu, who left a large tachi signed Teiji 5 (1366), designated an Important Cultural Property, and Nagayoshi, skilled in the Sōshū tradition; together they supported the prosperity of Nanboku-chō Bizen. Kanemitsu was also renowned as a smith of exceptional cutting ability, with transmitted works bearing alternative names accompanied by martial anecdotes such as "Wave-crossing Kanemitsu" and "Plane-cutting Kanemitsu"; in later saidan-gikime (cutting tests), he was ranked in the saijō daigyōmono (highest class of cutters). As a representative smith of Nanboku-chō Bizen, his reputation has remained unshaken to the present day.