This Art Deco Industrial style shade measures 11-1/4" in diameter and 8" deep. It's marked "BRASCOLITE PATD.. Oct. 21 1913, DEC 23, And MAR. 3. 1914 - THE LUMINOUS UNIT CO. SOLE DISTRIBUTORS" There is a smooth chip on the rim, please see the last picture. Overall it's in wonderful condition for its age.