Discovery of the Inverted Jenny
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 pass to print the blue vignette. In the rush, nine of the 20,000 sheets printed had been hand-fed through the printing press upside down. The mistake created an inverted vignette and positioned the plate number on the bottom selvage. At some point, eight sheets were found in the BEP office and destroyed. However, a single sheet made its way to the New York Avenue post office branch in Washington, DC.