For 3943 there doesn't seem like there are lot of them that come up for sale. I remember playing one a few times at an arcade and thought it was kind of a cool layout with the back glass. Mr Pinball and most price guides will state quite clearly that the prices are for a game in "good working order and shape". For anything above that restoration wise, its subjective. If the buyer and seller feel good about the sale then that's all that matters.