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dennis#1-180 can have grey backs or white backs. looking at my '56 topps between 1-100 i have 75% white backs. but from #100-180 i only have 3 white backs. are the white backs more common than grey in #'s under 100? are the white backs scarce between #100-180? in general are the grey backs more common on all the #'s? would the be a premium paid for white backs in general or are only over #100?