Union Porcelain Works of Greenpoint, New York was the first American company to make oyster plates. Their plates were decorated by adding three dimensional sea creatures such as fish, crabs, frogs, shells, seaweed. They were individually done, so no two are exactly alike. UPW made three sizes-- a round, a small oval, and a large oval. This is the large oval. It is 10 inches across the long way and 7.5 inches the short way. The plate is in beautiful condition and has two marks on the back. Both are shown in the pictures. This oyster plate has a small red crab, mussel, tiny green frog, assorted shells and seaweed, plus realistically done oyster shells; The lustrous pink background adds a splash of color.it is an outstanding example of the designs of Union Porcelain Works.