The 2 marked decks are little bit different from each other. For one of them (Standard Edition), the face of the cards are normal. For the other (Retro edition), the face of the cards have no corner index - This is what the face of playing cards looked like hundreds years ago!
The marking systems are totally different from any other playing cards on the market. You can immediately identify ANY card by just a glance, easy to read and hard to detect.