I can't find any information about the country of origin for the manufacturer "Gallery by Inhesion (ギャラリーバイインヒージョン)" even after searching. Due to the humor in the kangaroo and crocodile illustrations, I suspect it's a foreign product. Many of their mugs seem to have lids, but this particular item does not. I understand that these products are becoming difficult to obtain. The diameter is about 8.5cm and the height is about 8cm.