You've found a 8 3/8" Corning Ware lid for a casserole dish! Marked "24 Pyrex A9C," this clear glass lid measures 8 3/8" total and 9.5" diagonally. It has a very, very tiny chip right by where it's marked "Pyrex," but it's so small, it's really not objectionable. I will double-box this Corning Ware 24 A9C casserole dish lid for safe shipment.
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