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DavidWhile some unique cards attract monster prices (Darby, etc), a number of unique to ulra rare but severly obscure cards fall beneath the cracks. This includes the Frederic Photo Babe Ruth (I think 3 known to exist) and a few unique 19th century HOFer trade cards.
Popularity and resulting prices often is an unexplainable (to me at least) proposition. I understand why a 1unique 1912 Boston Garter Walter Johnson would be worth tons, but I have never understood the extraordinary prices for the Darby 'cards.' Then, I never understood the popularity of Ed McMahon either.