One thing you can do with raw vintage cards is what you have already done! Pick a player and a year (say 56 Topps Aaron) then do an ebay search for raw cards and start to analyze the condition vs price (also look at the "SOLD" listings and Buy it Now prices too). By isolating one year and one player you will start to get a feel for not just condition, but how condition impacts price.
Eventually you will start to get a feel for why a centered card with a rounded corner will sell for less than a sharp cornered card that's off center. (generally it's because PSA punishes centering less than corner wear if you decide to have cards graded)
It takes some time, but if you use the method above it will at least get you some time on tools as far as learning what you should pay for a card of a certain condition.
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"The large print giveth and the small print taketh away."- Tom Waits
Last edited by bravos4evr; 08-02-2016 at 03:01 PM.
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