I don't think the Coupons should be considered part of the T206 set for two reasons.
1) Burdick classified them as something different. Unless you're going to create a new classification system that's the way it is.
2) ATC and American Litho had a set of standards that they did not deviate from when printing the T206 issue. Several subsequent sets used the same images for different products but were not part of the T206 issue. They were a different project and had their own set of standards. Paper stock, team and player description color, etc.
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