This is an "I Love Grandpa" mug from American antique maker, Hazel Atlas. The smiley face is very cute. It's made of milk glass, and the color of your drink will show through faintly, making it beautiful. I purchased this at an antique mall in America. How about a gift for your grandpa? It is in beautiful condition with no scratches. - Material: Milk glass - Size: Diameter 7.7cm x Height 8.7cm Thank you for looking.