The SAPPHIRE BLUE 4233 Ironstone Robin Egg Blue Coffee Tea Cup Mug is a vintage Japanese stoneware cup made by the brand Sapphire. This contemporary original piece has a capacity of 8 ounces and is suitable for hot beverages. With its unique Robin Egg Blue color and art pottery production style, this mug is perfect for both unisex adults looking for a stylish and functional addition to their kitchen or dining set.