One of the rare Tokyo blacksmith who is still in production. Tanaka Ichirou is the blacksmith for Osahiro brand. He is over 80 years old, so he has once retired but there were so many carpenters requesting him to make chisels and plane blades, with his wife's persuasion he has come back, and producing tiny amount of chisels and plane blades.

Kakuuchi (box) style was prevalent before 1950. Some people (including myself) prefers this looks over modern decorative Shinogi style. Nagahiro can make normal Shinogi (beveled) style as well.