A yoroidoshi tanto (armor piercing dagger) Edo period (1615-1868), circa 1850 Hirazukuri, iorimune, slight sakizori, with a wide kasane, forged in itame hada in jinie, the tempered edge notare mixed with ko-gunome with nie, nioi, kinsuji, sunagashi and inazuma, carved on both sides with bohi, the ubu tang with one hole and kiri file marks, signed Mimasaka no kuni Katsuyama Shin Uenori, 11 5/16in (28.6cm) long, 5/16in (1.1cm) across at the munemachi, with a one-piece copper habaki, in a wood shirasaya storage scabbard With Hozon Token (Sword Worthy of Preservation) certificate no. 3010762 issued by the Nihon Bijutsu Token Hozon Kyokai (Society for the Preservation of the Japanese Art Sword,), dated February 4, 2016