Unlike other Bally electronic pinball games, their documentation for this game shows the model number only as 1245, not 1245-E. The player-controlled rubbered post between the flippers is also found on Bally's 1981 'Fireball II'. The backglass in the flyer shows a more physically revealing image of the Medusa than what appears on the production games. Artist Kevin O'Connor tells us about it:I painted the original revealing version and then was asked to paint over the naughty bits which truthfully, in reference to the groin area, was unintentional. It was just the way the folds in her gown turned out looking. I can't imagine that any made it to production before Marketing put the brakes on but I do remember glass prototypes came in before then. Usually 9-10 samples. The flyers must have been printed early on before the decision was made.