These are kind of neat (but not as vintage). These little LCD games came in kit form, you have to assemble the entire game (it even comes with the screwdriver). You can see the screws, some of the case plastics and the buttons in the middle bag, and the circuit board in the first bag (I believe the LCD is in there as well).

(If you have one of these sealed, open it carefully and remove the battery that comes included with it, it will corrode and damage everything.)