This is an unauthorized reprint, also known as counterfeit.  The primary obvious method of detection for this particular deck is the original decks had a red security band (tear off string).  While the methods to create these forgeries may change and improve over time, here are some previously known differences to help identify fakes - http://www.leeasher.com/playground/articles/how_to_spot_fake_jerrys_nugget_playing_cards.html