Shibuichi tsuba signed "Bamen Tsunemasa" with NBTHK Tokubetsu Hozon Tosogu.
Tsunemasa came from Bamen family that traditionally were armour makers. However during Edo period there was less demand for armour so many of it's members decided to change jobs. Tsunemasa studied with kinko craftsman Kikuchi Tsunekatsu. However when he became an independent craftsman most of his works were done in iron. This is a very rare example of Tsunemasa work in soft metal. Tsunemasa was born in 1741 and was active at least till the age of 75.
