This is a large oval platter marked "RRP Co Roseville, Ohio USA # 440." RRP Co stands for Robinson Ransbottom Company, a pottery located in Roseville, Ohio. The platter is a light grey-beige color. It has concentric rings over panels around the rim. The shape is the same as their Natural White pattern. This shape and pattern was part of their Kitchen Utility line. The platter is 15 1/4" long. There are no chips or cracks, but there are some large knife or utensil marks in the center of the platter.
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Happy New Year! Best Wishes for a happy, healthy, and prosperous 2017.