This is a beautiful Tokoname Bonsai Pot. A circular container is known as a maru. Maru pots can have any depth and may be vase-like.
Outside Dimensions: 9 1/2" x 9 1/2" x 5 1/4"
Inside Dimensions: 7 3/4" x 7 3/4" x 4 1/4"
Stamped by Kiln: Yes
Drainage Holes: 5
Anchor Holes: 0
Model Number: 11y18