What are the differences between Usuba and Nakiri? You state this knife is a Usuba and yet it has a double bevel - surely that means it is not a Usuba but a Nakiri.
We are sorry that you are confused. However, we don’t distinguish Usuba and Nakiri in Japan. They are almost same meaning. But I have ever heard that someone say that Nakiri is double bevel(Ryouba) and Usuba is single bevel (Kataha). Then we will write single bevel or double bevel in Usuba(Nakiri).