This is a great pair of pottery-look mugs by Royal Sealy, Japan. They have the sticker on the bottom. The body of these mugs feature a significant ring pattern with a mod style design on the front and back. The designs on the front and back vary a little. Though these look like heavy pottery, They are ceramic made to look like pottery. These are standard sized mugs measuring 3 3/4" high and 3" in diameter. Both are in excellent condition.