This Art Deco Industrial style shade measures 11-1/2" 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" It's in good condition with no cracks but the inside rim is a little rough and has one small flaw..