Supply and demand. I, too, love the old OPC sets but the early years are really tough to find in nice shape and complete a set, so I think a lot of people are scared off of them so I think that depresses the price/sales a little. I think they've found some general gains over the last few years though. I bought a NRMT/MT 1975 OPC set at the National this year. Was really pleased.
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