When I first saw the card, the fact that it was upside down made me wonder what was on the back, and if there were multiple strikes like I've seen on others. I simply assumed that no auction house would fail to mention something like that, and remembered recently that they at least wrote "Printing anomaly" for a ghost image, which was referenced by Erick. There is literally no excuse other than complete ineptitude for not mentioning this. If you become interested in T206s, even if you're are just being introduced to the hobby, you know within about 3 weeks that T206s with errors such as that are worth thousands of dollars. So, I surmise that a back scan was provided once asked for, or buyers close to the area personally viewed the cards.
Great for the buyer, and a sizeable difference of potential income for the consignor. I wouldn't consign a single thing to Hunt Auctions, even if I got the BP as well.
On another note, WHAT A CARD!
