This is a vintage Corning Ware casserole dish in the Blue Cornflower pattern. It has a 3 quart capacity and comes with a Pyrex lid. The dish is square-shaped, measures 10 inches in length, 8.5 inches in width, and 3.75 inches in depth. It is made of glass and is oven-safe, microwaveable, and dishwasher safe. The casserole is suitable for use on induction, electric, gas, and microwave ovens. This original mid-century modern piece was produced in the United States and has a printed backstamp.  There are no chips nor interior markings nor any flaws...it appears to have never been used.