I come in on the side of T213-1 being part of T206. I believe that the overwhelming number of similarities outweighs the one difference that seems to exist. The obverse design is a 100% match. The border, font, framing and inking are identical. Not one T213-1 used a photo that was not used in T206, nor are there any cropping differences that I am aware of. The odds of that seem slim. Ted Z. has already posted the backs; the designs of which speak for themselves. And, Coupon was an ATC brand at the time.
That leaves the card's stock. It seems that Amer. Litho. stopped the presses (literally) and fed new, thin stock for the Coupon print run and then returned to the thicker stock for the rest of the T206 run. Did this represent a print run "between" the 150 and 350 series of T206? Was it an experiment by ALC for the ATC that was discontinued? Was it, as was suggested above, a matter of economy? Whatever the answer (and I don't mean that list to be exhaustive) the facts lead one to believe that T213-1 was printed at the same time as T206 by the same company, for the same company. Those facts lead me to the conclusion that Burdick may have erred. Hey, even Cope put the Elasmosaur's head at the wrong end - great expertise does not equate with infallibility.
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