This is an 11″ antique porcelain Haviland Limoges, “Commodore” pattern oval serving platter. According to its backstamp it was produced between 1894 and 1932. It has a bouquet of roses in the center and similar bouquets around the rim.
This platter is in very good, used condition. Take a look at the pictures, and if you have questions, please e-mail.