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Stamp issued by the Republic ofPanama to honor Lindbergh's good-will flight to Central America. The use of "Step and Repeat" machines, by means ofwhich the design of an individual stamp may be repeatedphotographically as many times as required onto a singleprinting plate, has enormously advanced the lithogra-pher's art and made it quite impossible to plate with anydegree of accuracy modern lithographed stamps. Ourannual Christmas seals are printed from plates of as manyas sixteen hundred subjects by this method. The relief method of printing has one positive advan-tage over the steel engraving: it allows the printing of |
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