Hi Lee,
I have scans and small write-ups on each back variation from both series on my website. Probably best to refer you there -
www.t3turkeyred.com. In general, first series cards will have 3 backs available, second series cards will have two.
Hi Marc,
I have the Doolan w/checklist and Turkey Red back and the Doolin w/Turkey Red back. Previously, I'd been convinced that the Doolan would only exist with a checklist back, but then after years of looking, was shocked (and pleased) to find it with the Turkey Red back as well. The Doolin is an extremely rare card, but I'm confident that the Doolan w/Turkey Red back is actually much more rare.
As an aside, I also have a beautiful Doolin card with a blank back. I think there is good reason to believe it is a proof, but can't really be sure.
Best to you both,
Craig