My wife enjoys using two Japanese hammered knives and both have the signature mark noted below. I've found strikingly similar knives made by Yoshihiro, Togiharu and Norisada, and am guessing that all or some of these knives are made by the same or closely related craftsmen; but none of the ones I've found carry the signature noted below.
Does anyone know this marking? And can someone explain my observation of strikingly similar-appearing knives with different brands?
Thanks.
--John J.