This is a hat bowl by Tetsuya Otani. I purchased it at Otani's exhibition, but I haven't had many opportunities to use it, so I'm putting it up for sale. It's almost unused, so there are no noticeable scratches, but as shown in the attached photos, there are thin brown lines and black spots that appear to have been created during the manufacturing process. Size: φ approx. 25.5cm x h approx. 6cm