It's kind of hard to determine a value unless we know how much playfield wear there is, how the front of the cabinet and coin door area looks, how the left side of the cabinet and head looks, and if it plays. From what I can see it looks nice. Add-a-ball games such as this had low production runs which tends to make them a little more collectible but not a lot. Ballpark price without knowing the above information would be between $400 - $800. If the whole game looks as nice as your pics and plays, lean toward the higher end. Games that are in excellent condition - look like home use only with low plays - might demand more.

Dave