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T206CollectorAs you may know, I am a HUUUUGE supporter of SGC and am thrilled not only by the post but also by the response. However, I cannot let Dave off the hook so easily:
[The first category includes things like erasing light pencil marks. . . . These are examples of procedures that, if done carefully and properly, are unfortunately undetectable. . . . Often these procedures are done improperly, they leave telltale signs that we consider to be evidence of tampering, and we reject the cards.]
The suggestion here is that light pencil erasures are acceptable only if they do not leave any tell-tale signs. I know that this is not SGC's standard, because I have plenty of T206 cards graded by SGC with poor quality pencil erasures on the back that have been reduced in grade as a result, but nevertheless encapsulated.