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JoannI don't think a method can be dispelled solely because of the lack of surviving artifacts of that method - eg, cards could not have been made in coils because if they were, we would definitely see a coil somewhere. By that logic, T206's were made in horizontal strips no more than 5 players wide, because that is the largest piece that has survived.
I still don't think they were made in coils with 2 printing steps because the side-to-side back cuts above disprove it. But other physical processes (sheets, etc) need to be considered despite the lack of surviving remnants.
IMHO
Joann