Great thread, I have two questions (for now.)
1) Who came up with a system whereby the difference between a 6 and a 7 can only be detected with an electron microscope whereas a 1 grade can be anything from a gorgeous card with severely rounded corners or minor paper loss on the back to a card that has been thrown into a puddle of diesel oil and run over several times by a tank? Did that come from coin grading?
2) Does the condition of the slab ever affect the desirability of the card? If so, how common is re-slabbing to get the card back into a pristine slab?
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