Tim
You have to be careful with this premise of yours, as it has an underlying fallacy......
"The proof again for me is that at no time in the T206 run did they print both 150-350 and 350 Only subjects at the same time."
From the printer's viewpoint at American Litho (ALC), in the Summer of 1910, all 48 Southern Lger's (SL) were no longer 150/350
subjects. They were simply 350 series subjects, since ALC had then switched to printing PIEDMONT 350 backs on all 48 SL cards.
Recall, that one factor that we both agree on is....that ALC pre-printed sheets with the front images. The backs of these sheets
were blank, awaiting ALC's printing of the various T-brands (as the demand from the various tobacco Factory's came in). Actually,
as far as the printer was concerned, these pre-printed sheets had NO series identification, since they were blank-backed.
Since the COUPON Tobacco Co. was a new acquisition by ATC, they most likely cobbled together in a hurry this COUPON set to get
these cards out to the New Orleans factory. So, some smart designer at ALC checked-out the Sporting News (or a Reach BB Guide)
and selected 20 ballplayers (from the 48 Southern Lger's) that played in the Southern Association.....and, included them along with
the 48 Major Leaguers to create the T213-1 set. It's simply as neat as that. It's not "Rocket Science"
TED Z