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JonWhat Richard pointed out about the Old Mill is interesting.  Also, I must disagree about the Hindu.  I have heard that Hindu's, among other brands, did have 2 cards per box.  In fact, the advertisement even states 2 cards besides depicting 2 cards.  Supposedly, Polar Bear packaged up to 5 cards per pack.  Also, as for the rarity question - yes they were distributed in small numbers.  Finally, I believe Hindu was one of the more "expensive" brands as opposed to SC or Piedmont, therefore they had a much smaller purchasing group.  I believe this can be compared with Dog's Head from the N series.  I have often heard cards were packaged with Dogs Head because the cig brand was so unpopular, Goodwin hoped packaging the cards would spark sales.