I voted that erasing the light pencil mark is an alteration. The reason is that I think it's too fine a line to where people are saying that as long as the erasure isn't noticeable under 10x loupe, it's fine. Then what if it were a pen mark that a paper conservator removed where the removal also wasn't noticeable? What if someone were trimming a T206 Wagner or Plank where the trim job wasn't noticeable? If the owner of the card doesn't like the mark on it, sure, he can remove it, but then the card should be advertised as having the mark removed, and let the buyer judge whether that makes a difference in the price he would pay for it.
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