sixpenceee:A map hidden inside of a deck of cards. During World War II, the United States Playing Ca
sixpenceee:A map hidden inside of a deck of cards. During World War II, the United States Playing Card Company joined forces with American and British intelligence agencies to create a very special deck of cards. This deck was specifically created to help Allied prisoners of war escape from German POW camps. These decks when places in water could be peeled apart to reveal a hidden map. (Source) -- source link
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