it seems like the grading companies haven't seen the Mantle or Berra before either - in fact I'm not sure any have been graded. It really seems like the Robin Roberts was the only other card from this set that was known because it was shown in the big vintage guides. Maybe anyone who got one of the cards mailed it in for the deal described on the back (an autographed 8x10, member card, pin, and full postcard set). If they would have fulfilled that offer, you'd think we'd see some of those items periodically, so maybe the dog food company didn't last long. Very cool to think that it could be the rarest Mantle card out there! ... and Yogi too. I figured this would be the place to ask for help with any information on this set or these cards (thanks in advance!).
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