There is no marking, but this is a Shiroyama steel knife. Shiroyama Hamono Seisakusho is located in Sakai City, Osaka, and manufactures knives for professional chefs. It cuts well, is light, and has a thin blade. Approximately 1mm thick. A sujihiki knife with a blade length of approximately 25cm, easy to control. The wood appears to be rosewood, and the grain of the handle is beautiful.