This is a Bizen-yaki sake cup (guinomi). It has a mark, but the artist's name is unknown. There are slight size variations, making it a pair of sake cups. The beautiful patterns of sangiri (wood-fired) are wonderful, allowing you to enjoy the aesthetic beauty of Bizen-yaki. It has a cute spiral pattern. A modern and wonderful item. It's a lovely piece of pottery, good for practical use or display. How about the art of fire, Bizen-yaki? I will pack it and ship it via regular mail or Mercari delivery service.