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Jim VBUsing the same 2007 SCD values, the 1932 (really 1933) US Caramel set is worth about $20,000, PLUS THE LINDSTROM! That card is worth $80,000 in VG and only 3 have been found.
One set got you a ball, valued then at $1. Three sets got you a glove, valued at $3.
In non-sports cards, US Caramel did the exact same thing with their 1932 American Heroes set of US Presidents. They only printed a handful of McKinley's. That card alone is probably worth $30-50,000.
A complete set got you a pound of caramel candy.
In both cases, they did return the cards, but with a special hole punch in them, so they could not be redeemed again.