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nbbrazila better lesson is buying a card you thought was authentic/untrimmed...and finding out it is. the lesson you're talking about is a tough one...but is rarer and really didnt cost you any money (besides the possible profit).
not pre war, but i saw a crisp 1954 hank aaron johnston cookies on ebay once...raw. i asked the seller for many scans...and, based on these pictures, the card looked like it could grade at least a 6. I put in a snipe....but, it wasnt high enough (second bidder). i contacted the buyer after he graded it....it got a PSA 7...SMR twice the amount he bought it for!