Matt, why then are the different ad backs not considered variations to the set? to me with your reasoning they should be included as a variation. I do not believe there is any so called complete set of T206s that has a back variation because other than the advertising there is no back diferences.
One other question, These cards were not all manufactured at the same time and same place, so the theory about correct a printing after a certain back is produced does not seem like a good arguement to me.
Lee
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