This pewter plate measures 9" in diameter with a rim of 1 1/8". The marks are visible on the bottom, but I cannot make them out. "T.W." are the only definitive marks though I can see others vaguely. I would believe this is 16th century pewter but I cannot verify that. It is covered in scale. The edge has two splits. There are several pin holes that are visible in the light. This is truly an antique piece of pewter that shows its age.
Antique Pewter Plate, British, Unreadable Marks