Fenton French Opalescent Spiral Optic Hurricane Lamp Shade

This is a nice big Fenton Spiral Optic shade in French Opalescent, made circa 1939. Excellent condition, with no chips or cracks. (some tiny, tiny flakes on the inside of the bottom rim are a normal part of the manufacturing process on these. The rim was ground and chamfered and polished on the outer edge, but left unfinished on the inner) Nice opalescence with very well defined spirals. 9 3/8" tall with 4 3/8" diameter. The outer diameter at the bottom is 3 1/2" and the inner diameter is 3 1/8".