I believe this is Shigaraki ware. It can be used as a vessel, and is a wonderful vintage piece that has been stored for a long time. Please refrain from purchasing if you are sensitive to such things. Diameter: Approximately 18cm, Height: Approximately 7.5cm Weight: Over 480g as shown in the photo, suggesting a sturdy construction. Upon closer inspection, the center has a spiral design, and it looks like a beautiful sandy beach, creating a unique atmosphere. It might be fun for those with children, as it could resemble a flounder or a flatfish! It's also great for those who want to change the atmosphere, or for tea ceremony utensils or tableware. It's a good idea to collect it before it disappears!