Mattel Intellivision controller PCB (Circuit Portrait ix)
This is a simple, single layer design, but it's interesting because it's actually from a flexible "board", where the circuit is printed onto what looks like acetate.
(You can see a bit of it in this pic www.flickr.com/photos/euphy/19540315150/in/album-72157655...)
The circuit is folder in the middle, so that the button areas criss-cross each other. Pretty neat.
I imagine not very hard-wearing though. Considering the crudeness of some of the rest of the Mattel Intellivision, (the case, the controller housing, the multiple circuitboards in the main unit, the fixed cables etc), this part is quite nice.
The cable was terminated in a kind of 8-conductor leaf-spring, that pressed into the flexible circuit board.