This is a New Martinsville Prelude etch torte cake plate. Prelude is a floral etch on Radiance blanks. New Martinsville produced Radiance from 1936-1939. The plate is 15" wide. It may also be the punch liner. The plate has no chips or cracks, but it has several scratches in the center.
New Martinsville Prelude Etch Radiance Torte Plate 15 IN