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barrysloateThere is a checklist back and a Turkey Red ad back. The checklist back has several variations, including different checklists, and an expiration date at the bottom that appears on some cards but not others.
Collectors consider the ad backs to be tougher, and certainly more attractive. There are, however, certain cards that are seen more frequently with the ad back. I think Walter Johnson may be one of those, and there are others.