For all of trading cards, proofs are usually blank backed, but some can have backs. It's often hard to tell the difference between a proof and printing error, and most such printing variations you find in a shoe box or garage sale will be the printing errors. If you aren't sure, chances are it's a printing error not a proof. That's playing the odds. However, as T206s show us, printing errors can have value too.
Last edited by drc; 08-20-2010 at 12:52 PM.
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