I have seen as high as a 6
They are tougher now than they used to be but 4-5 for nm or better cards with a surface wrinkle is not uncommon. The reason you do not see more are they are often either kept by the buy the card not the holder crowd for sharp discounted prices or they are scooped up by the card doctors and pressed or spooned out and resold as 7,8, and 9 grade cards.
Last edited by glynparson; 03-01-2016 at 02:35 PM.
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