Looks like the rarest T206 card is also listed, and no I'm not talking about the Joe Doyle. The Tinker Chicago/Cubs error variation. There's only 3 known to the hobby. I believe this is the same one that REA sold a few years ago.
http://sports.ha.com/itm/baseball/19...umbnail-071515
Definitely an interesting card. I think TPGs should list it as a legit variation.