Double Header is another unique game!  Bally made two separate games in one - the first game is a static bingo card with multiple spotted numbers and select-a-spot.  Red yellow and green lines can score double or triple.
The second game is a Magic Squares game.  It does not have the double, triple or quadruple scoring, but it has multiple spotted numbers.
Beautiful baseball-themed artwork round out this real bingo rarity!
Backglass:

Cabinet:

Playfield:
http://bingo.cdyn.com/machines/bally/double_header/resources/pf-double_header-1.jpg