Thanks for the reply Jeremy. My reasons for excluding them from the
T206 set is similar to your reasons for separating them from the Type 1 and 2's.
When I look at the T213-1's they stand out from the way any of the T206
backs were printed.
The T213-1's have three different groups represented in the 68 cards.
I randomly grabbed one of each from my collection as an example.
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Excluding Piedmont which was used on every card in the set with the exception
of Demmitt and O'Hara St. Louis these three cards are not found with the same
back on any of the T206 backs and the same thing is true for any combination
of one card from each group.
Then you have the minor league players. All of the 350 series backs have minor league players and most of them have over 40% but there isn't a
single minor league player in the T213-1's.
Other people have said that it looks like they reused some of the T206 plates/artwork after the printing of the T206's and I feel the same way
when I look at the group of cards used for the T213-1's.
The following is pure speculation... We know from many of the old newspaper articles that inserting the "baseball pictures" was a big success at the
time. I see the T213-1's as a cheap trial promotion. Print them with the old T206 plates on thinner stock and see how it goes. They find it's
a success so they have them printed on thicker cardboard and decide to change the captions as a cheap way to put their own brand stamp on them
without having to make a bunch of new plates.