Posted By:
davidcyclebackAs far as Pre 1980 cards cataloged in the Standard Catalog or Beckett Almanac, the Fans Cigarettes must be about the rarest, if not the rarest.
It can also be fairly argued that a set must contain more than one card. I looked it up in the dictionary, and I don't think there's such a thing as a set of one. Those one card wonders, while card issues, wouldn't qualify in the set category.