Just so pretty. Quite an old one, made of clay, the perfect pale lemon yellow, and with no number at the center of the white circle to identify it , so it rather transcends its intended function. I don't think I've ever seen a true clay one of this size, and to my eye it's just formally perfect, and nice and heavy and satisfying in the hand.
1 7/8” d and in very good condition, some general light surface cracking as evident, all to the good.