During WWII, special super secret decks of playing cards were used to help American prisoners of war escape from Nazi camps.
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Check out the articles for some great pictures!
No one knows for sure how many decks were produced, but the only two known surviving decks are in the International Spy Museum in Washington, D.C.. Plan your road trip and send us pictures!
POW Playing Cards Business Insider
wearethemighty.com POW Card Decks
Image Courtesy of the Bicycle Playing Card Company
Amazon has sold imitation decks: