Tanto signed Rai Kunimitsu (Meibutsu Uraku Rai Kunimitsu)

Uraku Rai Kunimitsu is a tanto (short sword) forged during the late Kamakura period by Rai Kunimitsu, one of the foremost swordsmiths of the Rai school in Yamashiro Province (present-day Kyoto). Said to be a grandson of the school's effective founder Rai Kuniyuki, Kunimitsu inherited the refined traditions of the Rai lineage from his father Rai Kunitoshi and produced numerous elegant tanto and tachi that are considered masterworks of the era. Several of his blades are designated National Treasures or Important Cultural Properties.

The blade measures 27.7 cm with no curvature (flat construction), a body width of 2.7 cm, and a tang length of 10.6 cm. The ji-hada (grain) is ko-itame (small board grain) with ji-nie (surface crystalline activity), while the hamon (blade pattern) is a bold, sweeping notare (undulating) mixed with gunome, with fine ashi and yo, deep nioi, and rich ko-nie — a vigorous and authoritative work fully representative of Kunimitsu's style.

The sword takes its name "Uraku" from its most famous owner: Oda Urakusai (Oda Nagamasu, 1547–1621), the youngest brother of Oda Nobunaga, renowned as a master of the tea ceremony and founder of the Urakuryu tea school. The blade was first owned by Toyotomi Hideyori, who bestowed it on Oda Urakusai. It subsequently passed to the Maeda clan of Kaga domain and eventually to the Token World Foundation.

Listed in the Kyoho Meibutsucho (the authoritative Edo-period catalog of famous swords compiled by the Hon'ami family under Shogun Tokugawa Yoshimune) as valued at 5,000 kan — one of the highest valuations recorded — the sword stands as a landmark piece of Kamakura-period Japanese craftsmanship. Designated a National Treasure in 1955, it is now held and displayed at the Nagoya Token Museum (Token World Foundation) in Nagoya.