Here is a 1977 NFL FOOTBALL Media TV Slide I have for sale.  The slide measures 2” x 2” and has the player name, position, team name and slide number on the front.  These came in a box (picture of the box is shown) and also the list of the players that was in the box is shown in another picture.  I have another list of these that are for sale for $1.99 (commons), $5.99 (minor stars) and also star player singles on Ebay.