Printing Errors
Type collectors do sometimes go after these things but printing errors that get into a catalog or recognized list bring the biggest premiums, because people are actively looking for them....like the 1990 Upper Deck Mike Witt that just sold on ebay.
I have collected Topps variations and errors for a number of years and normally, blank backs ( unless they are actual recognized proof cards) and wrong backs do not bring great premiums, even on older cards, unless they obtain some sort of hobby acclaim
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