The T215-1 set is more like the T206 set than the T213-1 other than the 100 subjects notation on back. The reason that the 100 number is significant to me is that no other T206 back has that distinction. There is the 150 back, the 350 back and the 350-460 back. Sure there are some t206 backs that don't state a number but T215-1 being the only one saying 100, and the horizontal back (also not on any T206 backs) are both somewhat of a deterrent to referring to that set as a T206 set to me. Also, the ACC is fairly random, we could be making a case for the T215-2, T213-2 and T214 sets being from the same set as well just w/ different backs--but this will never happen.
-Rhett
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