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Plastic Dogthat there are graded cards out there that I'm comfortable with; but most of those take up the entire PSA holder (can't tell with SGC, since while some of their holders are precut, many are cut to fit a specific card.) It's the cards that have quite a bit of extra room in the holders (usually top to bottom) that I question. It's hard to justify paying $400-500 for a PSA-8 T-206 when it is a little short in the holder. Maybe it is good. But if you go through and look at all of the "8s" on EBay, it's ironic how many of them have quite a bit of extra room either above or below the card. On the flip side, here's a card I would be comfortable purchasing:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1064089697
Clearly takes up the entire holder.