Large student lamp or hanging light shade, semi-translucent milk white color. This is a vintage replacement shade, new old stock from the collection of a small town lamps and lighting shop.
The shade measures about 7 1/4" tall, 12" at the fitter, 13 1/2" across the widest part of the shade. There's some roughness to the fitter edge left from the manufacturing process, otherwise excellent, it's never been used.