No one knows a lot of information on what is called the Mercedes Oyster plate. I have seen them a lot less attractive than this by Oyster plate sellers and never a lot of information but they do bring a good price. This one is colorful and signed on the back by the artist. We've had only 2 that I know of in many years as they are "unique"! This one measures 9" wide and 8" tall. It's a great looking plate!