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Joe_G.SGC actually outgrades PSA up to 2:1 on some prewar sets (Old Judges for instance) yet PSA has far more errors out there. And by errors I include mis-labeled, over-graded / inconsistent grading, and worse yet, graded when it should be authentic etc. So the argument of PSA grading far more doesn't ring as true when you only consider pre-war, yet the errors are numerous.
There was a time when PSA had a monopoly on grading with strong backing from both collectors and dealers alike. It took awhile, but it now appears to me that SGC has become the favored grading service.
Best Regards,
Joe Gonsowski