Quoted from whthrs166:Not all of them. Some (like mine) have a real back glass. They were the last W/B games to have one.
I've not heard of any SS having a real backglass. Would you care to share some pictures of that if you can? I have a red board prototype SS and regular production SS and both have a translite. I know the entire run of NGG is on a backglass and that was several years after SS.