This is a green Depression Glass low footed plate. It is not quite a cake plate, because it is not flat across the surface. There is a depression in the center like a giant saucer ring. The plate is 10 3/8" wide. It has an optic circle or ring design with faint intersecting lines. It may be one of the many block optic patterns made in the Depression. It is not the Hocking version, though. The rim has a cut floral design around the rim. The plate is in excellent condition with no chips or cracks.
Green Depression Glass Footed Plate Rings Circles Optic Cut Flowers