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fkwmy guess.... Alot of missing color T206 cards are handcut from scrap error sheets snagged up by dumpster diving kids, or brought home by printer employees. It would be easy to think many of the same type of print errors (missing color, offcenter back) show up within the same collection, especially if collections are older, as T206 print errors were not worth a whole lot until within the last few years. its just a thought
Frank