WOW this thread is a keeper. Here's a pic of my favorite EM playfield, Sky Divers (Bally 1964). I'm very happy that my playfield looks so great. This game is just so much nudging fun, if you're not the nudge type this will eat you alive. For a game from 64 it even has quite a complex set of rules or patterns to progress the sky diver from the plane to the ground, very very difficult or impossible to do in one play. For that reason the sky divers progress (on backglass) remains from game to game, great idea to bring in the money.
IPDB backglass pic - http://ipdb.org/showpic.pl?id=2193&picno=2077 mine is in very very poor shape so this one is better. As I've posted before I'm looking for another one, repro, re-draw etc.