this is an old concept. gai and beckett used to have on-site prescreens. gai would literally take 15-20sec per card under a loupe and yellow lamp and assign a sticker grade to it. cards with grades you like they take back to the office to slab, the ones you don't want slabbed you keep.
they are probably world-class graders as they can spot minute imperfection/assign grade/detect alteration all within first glance...
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