CLASSIC Corning Ware Cornflower Blue Baking Roaster Casserole Dish. Vintage, but only used maybe 3-4 times, in awesome condition!  Made in USA.  Stamped "for Range and Microwave".  Dimensions printed on bottom are 13x9x2 (approximate inner dimensions without handles).  P-21 marking at bottom. My mom used her Cornflower Blue teapot on the gas stove daily for at least 10 years. At the end of 10 years, it didn't look more than a few months old!  Still washed up completely white, no chips, cracks, or line fissures. Corning Ware is classic, beautiful, nearly indestructible under normal use.  Amazing stuff!