Jefferson Glass French Opalescent Coin Dot Lamp

We think that Jefferson Glass made these pancake french opalescent coin dot lamps in the 1930's. Previously thought they were made by Fenton, but Fenton's chimney is shaped like a pulled tulip -- not the bulbous shape seen here. This one has a rim-chip on the bottom of its chimney, hidden when sitting on its socket. It is 11" tall and about 8" wide at the base. Original wiring (2-prong plug).