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BobThe best "undiscovered" sets are the M116 Sporting Life set from 1910 and the 1914 and 1919 T213 Coupon set. Prices are still reasonable and collector interest remains low. If any of the T206 cards were issued with rare backs only like some of the T207s, they would be going through the roof, so I still think the T207 scarce backs are a great buy (plus I love the set).