From what I know... 1200ish for a decent working one... -200, at least, for a badly flaking BG, -30 for single flipper, -200 for Playfield pending on how bad those touch up's are (seems like multiple and doesn't want to brag about how it is good otherwise) and how the rest of it is. Does it work otherwise?
Already at $780 with the estimated issues but hard to really say without seeing pics. I would recommend seeing it in person to inspect the plastics, ramps, make sure drop down targets, magna saves work, etc. and assessing it from there.
Really is a great game though. Good luck with whatever you decide!