This is a vintage 1950s ceiling light fixture lamp shade of frosted bent glass. It is a square shape with what looks like a doily or lace painted on the clear glass. It is 11 1/2" square. There are small chips at the corners, and there is a short crack in the center radiating out from the center hole. The crack was probably formed when the center hole was drilled.
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.