Hi, I was just looking through my binder, putting in some cards that I just got from league, and, as I turned over the page, I saw a card with the Pokeball simble upside down. Thinking that a card must have been turned over, I turned back the page. Nothing was upsidedown! So, I took out Mew delta from POP 5, which was the card, and looked at the back. The Pokeball simble was upside down! I checked and rechecked, but the Pokeball simble WAS UPSIDE DOWN! Is this an error? If so, do you know how much it is worth? I never saw this before, so I'm just curious. Thanks in advance, Arceus999.