Put simply vintage is weird.
PSA generally holds the most value, but some collectors prefer SGC. I like SGC for prewar WWI stuff. Post I prefer PSA. To me they grade close to the same, but the way the cards look in the holder is key for me.
When it comes to grade vs authentication, grade will win out 95% of the time. The other 5% of the time a card may be labeled as authentic by SGC because of trimming but have magnificent eye appeal. This card may sell for 10x what a card graded a 1 or 2 would sell for.
Vintage that has a autograph is a whole different issues that I wont go into.
The great people at net54 can give you a better explanation Im sure as they deal more deeply in vintage than I do.
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http://s1243.photobucket.com/user/southernsportscards/library/?sort=6&page=1
Also check my COMC. Even if you don't use COMC I can have cards shipped.
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