This is a chop plate or round platter in the Petite Flora pattern on ironstone. It was made by Interpace of Japan for the Sears Harmony House store brand in the 1960s-60s. The plate is 12 1/4" wide. It is in very good condition with no chips or cracks, but there is considerable crazing. Please see my other items for more in this pattern.
Petite Flora Ironstone Sears Japan Chop Plate Round Platter