Diameter 12.5cm. I believe this is a tea bowl from around the Momoyama period. There are some scratches on the glaze, but it is a flawless, beautiful piece. The glaze of Ko-Seto ware is rich with Japanese scenery and has a deep flavor, offering a sense of calm. The tea bowl comes with a storage box. The color appears slightly different in the photos, but the color around the foot resembles the red to dark purple of Sobanai ware. It seems like it could be enjoyed not only as a matcha tea bowl but also as a rice bowl. AI Summary: Round, black ceramic tea bowl, perfect for tea ceremony utensils. - Color: Black - Shape: Round - Material: Ceramic - Use: Tea ceremony utensils Thank you for viewing.