I thought SGC was the first major TPG to come out w/ the 1/2 point scale. (I don't know why they didn't do it all the way, however.) Then when Beckett started grading, they also used the 1/2 point scale, and finally PSA came around to half points a couple of years ago.
Many people just don't like qualifiers on their flips, so SGC gives that option to those people. They lower the grade accordingly. However, obviously, you pretty much can't go lower than Poor (other than Authentic), so a card in a Poor SGC flip w/ writing won't cross into a NQ PSA 1 holder.
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