Holophane style early 1900s vintage glass shade with crimped edge, prismatic
rib optic design. This is marked Wellington at the fitter edge as shown.
This would work well for a simple pendant light or industrial style work light fixture. It's 4 1/2" tall, 7 1/2" across the opening, 2 1/4" across the fitter.
There's a few tiny nicks and fleabites to the surface of the ribs, not visible at all. Overall this shade looks very good, nice and clear without discoloration.