I'll try to keep this brief and if anyone cares for me to elaborate on anything just let me know.
The T206 set follows a very rigid rule when it comes to subject groups being discontinued. Once the print runs for the 150-350 Only group had concluded and the 350 Only group printing began the 150-350 Only cards were never printed again. Same goes for the transition to the 460 Series. No 150-350 or 350 Only subject is brought back during those print runs. The Coupon Type 1 set does just that. It combines 150-350 Subjects with 350 Only subjects. By the time the 350 Only group was being printed the Southern League players had been pulled from printing.
As far as the back design is concerned it does look like the American Beauty, Broad Leaf, Cycle, and Drum, but that is where the set similarities end. We know that the A+B+C+D group front images were preprinted and then printed with all four back designs. The sets are a match with the same players included and excluded. The Coupon Type 1 set includes players that are no prints in the A+B+C+D group. This shows me that the Coupon set is unrelated other than back design.
I believe the Coupon Type 1's were a unique set created using existing T206 materials to save costs but not part of the T206 set.
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