Description

Osafune Yasumitsu was a swordsmith of the Osafune school (Bizen Province, present-day Setouchi City, Okayama Prefecture) active during the early Muromachi period (ca. 1394–1440, Oei to Eikyo eras). He is best known as one of the "San-mitsu" (Three Lights) of Oei Bizen — alongside Osafune Morimitsu and Osafune Mitsumitsu — the trio that defined the second golden age of Bizen sword production after the first golden age of Nagamitsu, Kagemitsu, and Kanemitsu. According to touken-world.jp's Yasumitsu entry, he is classified as Josaku and counted among the finest smiths of the Oei-Bizen period.

The "Oei Bizen" (Oei-period Bizen) designation covers smiths active during the Oei era (1394–1428) and its immediate context, whose work collectively forms the most artistically accomplished phase of early Muromachi Bizen production. Among the San-mitsu, Morimitsu holds the greatest fame, but Yasumitsu is regarded as his equal by many kantei scholars. The lineage continued through multiple generations (with the title "Uemon-no-jo" held by the first and third generations, "Sakyo-no-suke" by the second), and dated works spanning Oei 1st year (1394) through Oei 31st year (1424) are confirmed from commercial sword records at iidakoendo.com and hyozaemon.jp.

His blades display the characteristic Oei Bizen style: graceful sugata with narrowing mihaba and saki-zori (forward-bending curvature) reflecting the Muromachi period's move toward shorter, more practical swords; jihada of itame mixed with mokume in a prominently textured grain with ji-kei-style highlights; hamon of open-based gunome with vivid nie, bright nioi-guchi, and clear ashi; boshi tending toward pointed, somewhat resembling an o-gunome cap, or returning in ko-maru. The work "Bishu Osafune Yasumitsu, Oei 19th year, 2nd month" (1412) has received Juyo Bijutsuhin (Important Art Object) designation, and additional dated blades survive as Tokubetsu Hozon Token — confirming his technical consistency across decades of production.

Yasumitsu stands as an indispensable figure in the Osafune school lineage and a co-pillar of the Oei Bizen achievement that kept Bizen Province at the forefront of Japanese sword production through the Muromachi period.