This is an 8-sun double-edged saw made by Sadagoro Nakaya. A blacksmith praised as first-rate by Nagakatsu, a master of saw sharpening. The straightening is also, as expected, first-rate. Sadagoro was a disciple of the 5th generation Inosuke. The younger brother of the 2nd generation Inosuke was the famous Sadayasu Shibuki. I also use this saw on site. This saw is difficult to obtain. Due to good storage, there is little rust and the condition is good. Thank you.