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barrysloateThere is something arbitrary about categorizing any of these sets, or grouping them together, because we don't know the intent of the designer or manufacturer. We could just as easily designate T206 as a master set containing 15 different series, and also say that anyone completing a set of 520/524 with different backs is in fact mixing series together. BUt collectors fully accept a set with mixed backs, even prefer it.
There is a tremendous amount of knowledge available today, something clearly not available to the pioneers of the hobby. But for all we know about T206 who is to say we've gotten it right?
Forgot to respond to Jon: the only problem with mixing the three sets you've cited is they look different. They use different fonts for the player name and team, and for me that is one of the strongest factors for not making them part of the same set. I guess we need criteria for these designations.