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PCI emailed the seller, and asked if he was aware that the card he was selling had the same flip as the Goodwin card, and if he could explain what is going on here. I gave him the link to the Goodwin auction.
The seller responded quickly, saying "The only thing I can tell you is this card came from an auction house in California."
I emailed back, asking him for the name of that auction house in California.
Will post his response if/when I get it ...