This is a 270mm (10-shaku) Ryoba saw made by Katsuo Shindo of Shinshu Suwa. Katsuo Shindo has passed away. While replaceable blade saws gained popularity and rode the wave of the times, his successor sold replaceable blade saws but unfortunately went out of business. Katsuo Shindo is a famous craftsman. For those who have been looking for one, how about this? There will be no further listings. There is little rust, and the condition is good. Thank you.