This is a Takatori-yaki teacup. It was a promotional gift from Suken Shuppan, given to my father in the Showa era for work. Takatori-yaki Yukiyama Gama Onimaru Setsuzan Onimaru Heizan - Color: Black and brown gradation - Shape: Round - Material: Pottery - Size: Drinking rim approx. 6.5cm x height approx. 5.5cm Unused, but has been stored at my parents' house for a long time. The box has some age-related stains. The tag has wrinkles. The underside of the teacup is reddish, but it's unclear if it was like that from the beginning. Please consider this item if you understand that it is an antique.