First thing you want to see
Picture of bonus area in the lower center of the play field. These games are notorious for having severe wear down to wood in the area.
Then check battery on boards- may have leaked and corroded a lot
If it powers up and plays I guess it's probably close to a grand if in good shape- possibly more if it's really really nice but without rebuilding a lot it's not going to be much more. These are often listed a lot higher but I am not sure how often they sell at 2k+ prices. It's a beautiful machine and it's socially acceptable. The more recent versions are quite a bit further down the man cave avenue. I have zero issues showing anyone this machine. It's actually pretty with all the pink and the awesome art work.
To be honest unless I knew it was playing well with good sound- lscore displays- BG flawless- and a very very good play field. I would think about much over 1K. And offer less. But I am cheap.