Search:

It definitely reads microtome to me. I have seen others like that. The groove (Fuller) is to break surface tension of the material being thin sliced so it can feed easily from the blade..
~Richard...

I have honed a couple. It is not something I would wish upon a newby, as I was! If you go to Glen's How to hone a Kamisori video, that will help. Flat side mainly and then the bevel only on the...