Yoroi doshi (armor piercing) tanto in aikuchi mount by Soshu Masahiro. I believe this to be the first generation Masahiro who worked circa 1455 and is rated Chujosako in Fujishiro. The nagasa (cutting edge) measures 9+1/2" and nie is packed all over the habuchi. Width at machi is 7/8" and thickness on mune is 9/16".
Sifu Kisu of The Harmonious Fist / The martial sciences as a tool of self cultivation and self realization. / Pursue the good roots of non-contention / Les Ėtoiles / Bak Siu Lum Pai / ☯️/ Baguazhang / Jian Fa / Tao / Dharma / Science / Technology / حبيبي