Topps definitely tweaked the high number sheets in 66 and 67. You would need both 132 card half sheets from each year to tell but the SP's are legit. I've never seen a 66 high # sheet (I don't think), but have seen a 67 sheet and a scrap of another, different sheet. Some cards get legendary status they deserve and some don't. Like Brooks Robinson in 1967, where the scarcity was perceived but not real because of an early hobby find that must have only come from cards printed on one half sheet. And I believe the 66 Jackson is not all that tough compared to some other cards in the highs. There is a lot of disparity too in which cards people think are the SP's in '66 to boot.
There's 11 true SP's in 1967 and I studied the hell out of those highs to figure it out but I never really looked at the 66's. 1965 had a 77 card high series as well but it's not yielded any type of true SP's. 66 and 67 were both 77 card runs as well and something intentionally happened when those were printed. We just don't quite have all the pieces yet.
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