First off let me say that I love these cards! The stock, finish, design... all of it. In staring at the back design I noticed a few small details that make them a one way deck. This is not like the Guardiens where the design is offset in the white border. There is a little of that but it is not consistant enough. The first mark or tell that i noticed is located in the background of the design between the sword handles. It's easiest to spot on the box. On the left side between the handles there are two small circles (they almost look like the hinge side of a safety pin). On the left side there are two circles where as on the right there is only one. It's a very subtle difference that you would not see if you weren't looking for it. The second tell that I found was at the base of the split spade on the back design. At the base of where the split occurs only the bottom of the right side is shaded or "marblized" the left is mostly smoothe. This is a little harder to spot than the circles but if you have a sharp eye you can catch it. These two tells can work to find a reversed card in the deck. After I found them I couldn't help but notice them. I have since found it very easy to locate any number of reversed cards. Cheers!