WWII playing card deck with hidden escape map for allied prisoners of war.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...1_fullsize.jpg
More:
https://bicyclecards.com/article/a-m...ide-the-cards/
Previously:
Playing card shuffling machine - GIF
Antique playing card trimmer - photo
Poker card cutting machine - GIF
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