This is an unauthorized reprint, also known as counterfeit.  The primary obvious method of detection for this particular deck is the original decks only came in blue and red, green was never created.  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