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Joe D.I consider postcards, exhibits, candy cards from boxes, etc. - all to be cards.
My criteria for a card is: a commercial printing on cover weight paper - featuring a baseball player(s).
The key is cover weight paper (card stock). If it is on text weight paper (like a supplement) - it is not a card.
Why is the tobacco company 'card' any more a card than a postcard company's card?
Both set out to make some extra $ by using the the game of baseball and its players in a promotional printing.
The difference between the two is just distribution - nothing more.