Thank you for submitting your item for appraisal. This appears to be 16th century Swatow export ware blue white charger from the Binh Thuan shipwreck. There is a larger firing flaw and the typical sand adhesion on the base, showing the outline of a hand. Similar items have been sold at auction. The enthusiastic bidding on shipwreck porcelain has ceased. The estimate is based on auction results for similars.