This is a VINTAGE Pyrex Corning Ware Replacement 10" clear glass lid with a square domed cover.
It is a casserole lid suitable for a 1970s-1979 production style pressed glass Pyrex Corning Ware A12C model.
The lid has a flat-bottomed design, is freezer-safe, non-stick, and dishwasher safe.
Made in the USA
It is in excellent condition free from chips or cracks