Small 3.5X3.5 inches. 1.5 inches deep glazed pottery?? Shell dish.
This is a late 20th century to 21st century porcelain restaurant ware piece with illegible Asian country origin mark on the underside. In the molded form of a seashell with blue crystalline glaze this would be used for sauces such as soy sauce or to present wasabi with sushi. The estimate is based on actual recent past sales of comparables.