1986 Topps #374 Steve Young - Copyright Line C* or D*?

Board sleuths please share your knowledge if possible about this. I'm curious to know which, if either, demands a premium. I saw a NR-MINT copy sell last night for $976 in a GMC auction with a letter D* on the reverse. What the .... ? Was this just a high stakes battle? Or a rare card?
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Comments
C and D sheets were printed in the same quantity, so neither is rarer than the other. Full sheets actually consisted of 264 cards, usually one unique 132 card sheet per side. But for several years in the 80s (for football), Topps printed the same cards on the C and D sheets.
Thanks for the explanation. I assume the price is just part of the recent raw card phenomenon, then.
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