2022 Women Cryptologists of World War II Forever Postage Stamps – First-Class Mail, Sheet

$29.00

Quantity

5 Sheets of (100 Pcs) 25 Sheets of (500 Pcs) 50 Sheets of (1000 Pcs)

Quantity

Pictures a World War II-era WAVES recruitment poster overlayed with characters from the “Purple” code with random letters. The reverse side of the pane of 20 includes the cipher needed to read the message on the front of the stamp.

One of the most infamous codes was generated by Japan and their Type B Cipher Machine, codenamed “Purple” by the United States. Members of the US Army Signals Intelligence Service (SIS) were assigned the monumental task of breaking it. This included thousands of women, of whom Genevieve Grotjan became a central figure. After 18 months with no headway, the SIS team was at a loss for what to try next. Finally, in September 1940, Grotjan made a discovery that turned the tide in our favor. She found trends in Japan’s coded messages that no one else had detected.