Not much, as far as I can tell. I bought a collection of OPC cards once and was surprised by how little they are worth. The average card costs more but not by a ton. So few people collect OPC relative to Topps, I guess. I got into them because of my player collections and my love of all things 1971 Topps (OPC has much nicer backs and stock IMO). I try to pick up nice HOFer examples on the cheap when I see them at the National or on eBay.
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