I would guess there are roughly 50-100 sets that have 515+ different. What constitutes a set is debatable. Doyle NY Nat'l and Magie error could arguably be considered not necessary for a basic set, but only for a "master set" that includes error cards. That would be like a 1979 Topps Bump Wills set being complete without the "Rangers" error card (team change corrected early in print run). Of course one could be completely crazy with "master set" and aspire to all possible front/back combos. That would be near impossible, but would be fun to try.
JimB
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