Vintage Wilton pewter dish with clipper ship

This beautiful pewter dish is 11'' across. It is heavy in the hand and in very nice condition,only a few surface scratches. It has a 4 1/2'' clipper ship in the center. It has several hallmarks on the back. One is a circle with RWP in it. It says Wilton Columbia Pa. and USA with 3 other hallmarks that I can't read.