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JosephThe "A" wouldn't stand for authentic since any card that has been graded/slabbed is assumed to be authentic. Inauthentic (unauthentic?) examples are not slabbed or graded (maybe someone should start a grading service for fakes).
Here's the SGC code, from their site:
http://www.sgccard.com/grading_scale.htm
"A"ltered, it is...
edited to make link work...