I agree with Rhett's point about caption updates. And with Tim... And it is obvious t see that we all still think of this much as we did last time we thrashed with it.
I don't buy the idea of what if Mr. Burdick wrote the book in 1912... he'd have lumped them all together. To me that is an argument for separating them, how things can be better seen and understood with the perspective of time.
As for Ted's great scan of backs back there in post #35....
These bad boys bolster keeping Coupon's separate from T206s. All of those cards up there mention series 350, but for one. And that one is the one with those quotes. And that brand kept on with glossy front cards with the same images, blue captions with the same images, and updated captions years after T206 production. Those rascals seem different to me.
I think the Coupon cards and the Red Cross Cards were made by pilfering the artwork and style that had gone before with our traditional white border tobacco cards.