Here's one of the prize-winning cards from the 1968 Atlantic Oil set. With only a few $100 prizes, there were only a handful made and I have never seen another one.
This Ruth is rare, but not as rare as the other cards shown in this amazing thread. I just love the way it looks...and it really bugs the guy who sold it to me when I post it.
REA sold a 1.5 for $4,680 in April.