I know it's not baseball, but the answer for me is the card in my avatar. Lorenzen with car is a legendary rarity from the landmark 1972 STP racing set. Long-time racing super collector Jon Hardgrove wrote over on the non-sports side of things that he had only previously seen one example of the card in 26 years prior to purchasing his Lorenzen w/car card.
I talked on the phone with another long-time racing collector in Connecticut who I purchased some cards from, and she told me it took her 20 years to find an example of the card -- and that one had a pinhole in the card from being tacked to a wall.
PSA only has one graded example of the card in their population report (although I did just submit mine for grading with them last week).
I was shocked when I saw an example of the card show up at auction on eBay last year.
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