This art pottery mug features a surprise frog at the bottom and a brown glaze. The round shape with a 4 inch diameter and 3 inch height makes it perfect for all occasions. The mug is made of stoneware and has a unique contemporary style with animal theme. It is an original piece, unmarked, and not known if vintage. The production technique is art pottery and it was made with care instructions to hand wash only. This mug is perfect for those like frogs and surprizes