I see the card up on eBay.
Click on this seller's feedback and then click "Received as a seller." You will see that he only deals in modern cards. Does he know his vintage cards? If somebody switched that Mantle card, would he be able to catch it?
I bought a PSA 5 this year, but I got it from a person who has sold many high-end vintage cards before, so I was very comfortable dealing with him.
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