These are porcelain products from Johnson Brothers. Made in England, they are dishwasher, freezer, and microwave safe. This mark was used on famous series such as Blue Willow. They are collected as vintage tableware. There is a bump on the back. I have included it in the photos, so please check. - Set includes: 4 plates - Country of manufacture: England - Design: Scalloped edge No box Purchased in the USA Thank you for looking.