The one thing a TPG does that is indispensable, assuming they get it right, is to determine whether or not a card has been altered. Most collectors can't do that themselves. After that, I don't know. The numerical grades are dubious at best, and really of use primarily to the registry crowd. And any collector can determine if he is happy with the centering. That's just a visual.
The 1971 Clemente is a beautiful looking card and deserves the choice designation, but I want that sticker put on by a third party, and not by the seller himself. If the seller did it, it has no meaning at all.
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