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Josh K.I have to disagree. If the card were one that has a known overprint, that is one thing. This is simply some collector who put toy town stamps all over his cards. Its not an overprint, its a mark. PSA grades normally and puts MK qualifier on it. SGC does not grade in that manner. The mark is considered as part of the technical condition of the card.
Richard - if you look at their grading scale, the card could be a 100 w/o the mark and it shouldnt receive any better than a 30 with the mark (this is also how they treat paperloss). This may be a poor example since the defect is on the front, but this card would be a 50 or 60 w/o the paperloss. Yet it doesnt even merit a 20.