SGC is more forgiving on corner wear. PSA is more forgiving on minor wrinkles and marks and spots of paper loss (or they miss them more frequently). I have questions about the purity of both companies for different reasons; hope I am wrong but have seen an awful lot that doesn't make sense.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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