Well if it is complete and in working order, with a good condition Play-field and an average or better back glass, If you can walk up to it and play it.
I would offer him $225.00 $250.00 tops.
Figure in Very good shape this is a $450-500 machine at best . Thinking you will have to shop it out and do some xtra cleaning and tightening here and there.
I think anywhere between $200-$250 is a fair offer, obviously the cheaper the better/ In non working condition, say $100 is fair
Let us know if you buy it.
Brian Lenker
Madison hts MI
586-344-0721