Keywords: Shipbuilding 1957 issue-3c.jpg en US Postage stamp 1957 issue shipbuilding violet-blue 3c U S Post Office<br/>Hi-res scan of postage stamp by Gwillhickers Bureau of Engraving and Printing 1957 PD-USGov Ships on stamps Stamps of the United States 1951-1960 1957 stamps Purple stamps Commemorative stamps of the United States Pinnaces in art |