#15 stamped in handle. Wood handle seems cheaply made- but sturdy. There are some faint stamps on  upper blade near handle. Maybe this was made in haste, near end of war? I have several of these, and others seem to be made better? I will be listing more in future. All were attached to a rifle (Arisaka  38). I dont know if it fits on other models. Total length is 19.5" . Some small imperfections in metal on handle- in pictures. Rust from age.  This is an item I inherited. I know very little about it.