The Corning Ware A-1-B SHADOW IRIS A-1-B Casserole Dish is a vintage piece of ceramic cookware with a square shape and a white floral pattern. Made in the United States during the 1980s, this 1 liter/quart casserole is both oven-safe and microwaveable, making it a versatile and practical addition to any kitchen. Featuring a flat-bottomed design and a convenient lid, this contemporary style casserole is perfect for serving and storing a variety of dishes.