Corning Ware 1-3/4 quart casserole, stamped #P-1-3/4-B, from Corning Glass's Blue Cornflower series from 1958-1988. This is the original Corning Ware Pyroceram glass and ceramic material that can go from freezer to oven to table top. The Corning Ware 411 site shows that the mark on this casserole dates it to between 1966 and 1969.
This early generation casseroles are like the one pictured in this listing; the dish is in great shape with no chips or cracks and light wear. This is perfect for use on the stove top burner, in the gas or electric oven, and even the microwave oven. If you have any questions about a piece, please do not hesitate to ask me!