This is a natural stone Hōraiji-san Hōmeiki stone suzuri (inkstone) from Shinshiro, Aichi Prefecture. Hōmeiki stone is surprisingly common, but it's not very well-known, and many people use it without knowing its origin. The stone often has a layered structure, like thin wafers, and many pieces are more like plates than inkstones. This piece is unusual for Hōraiji-san stone, as it's a solid rock that has been ground into ink, resembling Kumano's Nachiguro stone. I'm offering it at this price. What do you think?