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JoannAssume that PSA grades more trimmed cards than SGC. Even considering proportionate number of total cards graded, that appears to be a decent assumption.
If so, I wonder why that is? I'll also assume that PSA is not doing this intentionally and has no interest in damaging their credibility. So what would cause the difference? Less experienced graders? Less time per "look"? Does SGC have something in the graders hands that provides betters clues to trimmed cards? Do they just have better lighting and magnification?
Maybe SGC, because it deals more in vintage, has people that only look at vintage all day long, and get an "eye" for it. Maybe PSA could assign specific people to vintage, better lighting, good instructions, etc.
Joann