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Marc S.not technically a mistake. More a result of the newly-introduced back designations from PSA.
Overall, there are seven PSA 7s and five PSA 8s of McCormick. The PSA 6 listed on that Registry set is an Old Mill PSA 6, of which only four have been officially designated as Old Mill, with none higher than the PSA 6. PSA's Set Registry does not indicate the advertising back of the card (even if listed on the flip), nor does it consolidate the population from other, different-backed T-206s.