Note the annotated "...." on the COUPON lettering of the 1910 card.....the significance of this is, that in the Summer of 1910
when these 68 cards were printed, ATC had a pending Copyright of this newly acquired T-brand in their monopoly. Therefore,
at that point in time (unlike the T213-2 & T213-3 issues), the "COUPON" issue is indeed just another T206 back.
P.S......In response to you last post......the T213-3's that I have are normal T206 thickness and they are narrow cut similar
to the American Beauty cards.
Also, circa 1914-15, production of COUPON cigarettes was transferred to Factory #8 (same factory as the VICTORY brand).
Therefore, some T213-3 cards are found overprinted with "Factory #8" on their backs.
TED Z