A clear glass lid for your vintage Pyrex 500 series 1-1/2 quart fridge dish number 503, which was the largest dish in the set. It will fit any vintage Pyrex colored 503 dish regardless of pattern, from the original 1947 Primary colors to the 1979 Autumn Harvest lines. The fridge sets were all discontinued by Pyrex in 1981. The lid measures 7 by 9-3/4 inches (including handles). It's in crystal clear, like new condition with no chips, flakes, fleabites, scratches, or stains.