This is a 170mm regional variation of the bunka bocho or santoku. It was made by Tosauchihamono in the Tosa region of Shikoku island. As you can see it's kurouchi, and is made around a blue#2 steel core. The manufacturer called it an 'inasa' hocho, but I have seen Japanese sites stating that inasa/Hakata bocho are interchangeable names (the latter is a little more familiar around here). Hakata is a region on Kyushu island - here is a link showing a shop that still makes the traditional Hakata bocho.
Anyway, I have 2 versions of this knife and I am keeping the fancier one for myself. They are multipurpose household knives. This one has not been used.