This is a vintage 1950s Pyrex 231 turquoise glass baking dish with a capacity of 1 1/2 QT. It is a rectangular casserole dish measuring 11 1/2" in length, 6 5/8" in width, and 2 1/4" in height. The dish is oven proof and was manufactured in the United States. This original Pyrex piece is a collectible bakeware item from the mid-20th century.