Posted By:
WesleyIf the pencil marks are erased in the future, the card should still be considered altered and should still be ungradeable. At most it would receive an authentic designation rather than a numeric grade. (Isn't that what happened to a T206 Wagner that had some work done to it? The improvements were later removed but when it came time to slab, it went into a holder that said AUTH.)
As far as value of the card, that is a personal decision. To me it makes a world of difference to have a card authenticated and graded, but I know there are some collectors who do not mind trimmed cards or recolored cards or otherwise altered cards.