18 mm wide blade 10 mm depth handle is 10 cm overall length is 27 cm
Please check the photos for better detail than what I can give. The rust in the photos are surface rust only. Nothing a good cleaning would not fix. Incredibly vintage. A good weight to it.
Quality Japanese steel with a name stamped on the handle which I believe to be the carpenter's name more than the chisel maker's name. The reason for this is I have recently acquired a large collection of tools and bits and pieces at a an auction with the same name on it. The name appears to be Ide Shoichi.