This is a natural stone suzuri (inkstone) of unknown origin. Based on the stone quality, it may be from Amehata in Yamanashi Prefecture, but I cannot say for sure. At first glance, the shape appears simple, but the back is slanted, making it an unusual and interesting form. The stone is hard and black, resembling Amehata or Ogatsu stone. I am offering this item at a very low price. What do you think of this price?