This tanto is a piece equipped with a special lacquered aikuchi koshirae, which is sprinkled in green. It is inscribed on the nakago with the name Nagasada. The preservation of the sword is very excellent, with no flaws or chips of any kind. The itame hada is very nicely done with gnome hamon. There is some chikei in places on the ji, and sunagashi can be seen on the ha.

Nagasada was a swordsmith from Mino Province (present-day southern Gifu Prefecture) at the end of the Edo period, born in 1809 as the child of a samurai. He is a descendant of Kaneshige, the founder of the Seki swordsmith school. The upheaval at the end of the Edo period inspired him to become a sword smith, and he initially apprenticed himself to Michinaga of the "Akasaka Senjuin" school. After that, he studied swordsmithing on his own and created his own unique style. While making swords in various locations, he once became a swordsmith at the service of the Kishu Tokugawa family. His work was not only very utilitarian but also aesthetically pleasing, but there are not many pieces of his work in existence and this tanto is very valuable.

• Blade length: 18.2 cm
• Curvature: 0.0 cm
• Number of Mekugi hole: 1
• Sakihaba: 17.7 mm
• Sakikasane: 4.0 mm
• Motohaba: 23.4 mm
• Motokasane: 6.8 mm
• Signature: Nagasada(front)
• Era: Shinshinto
• Structure:Hira-zukuri
• Jitetsu: Itame
• Hamon: Gunome
• Nakago: Ubu
• Weight: 120 g(Blade only)
• Koshirae: Aikuchi Koshirae
• Original Registration No.: Gifu 084928