Fred---I have a 84 Fleer set but no blank backs. I personally do not collect blank backs. From what I have seen blank backs, unless they are true proof cards like the 85 Topps Minis or 84 Topps Encased, or involve a star card, do not seem to generate as much interest as recurring front or back print flaws. I could be wrong and it might help to check completed listings for blank back cards on ebay.
It is mostly impossible in my experience to tell if most blank backs are proof cards or just error cards from the printing process.
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