The ad isn't for much. I don't doubt that there are Coupon ads from 1905...
The back similarity doesn't sway me, either.
I think the T206 progression is much like you and Scot Reader have it. But I think Coupons were an afterthought. American Litho looked around for the old plates and stones that were still serviceable, and printed Coupons from that. It was a second rate process. I think the newer designs for the 460's were used for T206s, and the initial designs were used for Coupon cards. I think Mr. Burdick had it about right.
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