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1. info.mysticstamp.com › this-day-in-history-may-14Discovery of the Inverted Jenny | Mystic Stamp Discovery Center

   info.mysticstamp.com › this-day-in-history-may-14

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   Hace 16 horas · May 14, 1918. On May 14, 1918, stamp collector William Robey discovered the now sought-after Inverted Jenny, #C3a. The Bureau of Engraving and Printing was in a rush to produce America’s first airmail stamp. Because the stamps were to be bi-colored, each sheet would be fed through the press twice – once to print the red frame and a second ...