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Andy BaranOnce again, I will defer to Scott B if he chooses to respond. He has handled many more cards than I have. It is my experience that the 150 Backs are slightly more common than the blank backs (very small sample). Cards with the overprint back are exceedingly rare. I think Pete Calderone has a scan of an overprint back on his website. I don't own any overprint backs, and never have.