This is a traditional Japanese carpenter's RYOBA, two edged hand saw. It was traditionally used for coniferous wood, post and beam work; the two edges each for rip cuts and cross cuts. This is a forged steel blade with the original incised inscription on the blade hilt. It has a wooden handle, now tied with tool-grade twine to support the blade end of the handle. This was got from a rural woodworker's tools, in the countryside of Japan. This saw is still usable with sharpening.