Generally on a card that grades a 50 but otherwise looks NM, there is a faint crease that may only be visible under a halogen light. There also may be some residue or staining as Leon mentioned. I'd try and replicate the grading environment as best as possible by using a halogen light in a completely dark room and see if that brings out a flaw. There are no new graders at SGC that don't know what a T206 is supposed to look like.
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