How to assign value to a Gottlieb World Fair pin?
I'm trying to help a friend in the Cleveland OH area put a reasonable sales value on a Gottlieb World Fair. This machine has been in their family's home for at least 37 years, possibly longer (person that would know more is no longer with us). I went over and took a look at the machine, but I don't know enough about Gottliebs to advise them. I took a bunch of pictures, and made some observations. Cabinet looks average for a machine that was at some point routed, but appears to be structurally sound. Inside of the backbox looks really clean. I didn't check the ball count unit to see if it moved freely. Front side of the backglass looks very nice, great colors and full artwork. Back side of the backglass also looks super nice, no peeling ink. Backbox door is present with key. Playfield looks quite nice for its age with good color and no areas I could notice of missing paint. Shooter lane wear is not bad. Playfield GI and feature lighting seems to work fine. Bumper caps are not burned and have excellent color. Game resets and plays fine as far as I can tell. Wheel in the center spins after the last ball drains to randomly score a car, not sure I activated what was necessary on the playfield to get it to spin during a ball. Cars on the backglass get lit "scored" at various points during play. All pop bumpers work, all bumpers and switches register and score, but one of the pop bumpers does not score although it does "pop" (needs a switch adjustment on the pop bumper relay I assume). Score reels seem to work fine. Flippers look nice and original. Chimes work. They tell me a pinball repair guy worked on this machine a few years ago, adjusting various things and replacing the rubber (except for a couple of mini post rubbers it seems). The owners don't work on the game themselves. Credit solenoid in the back has been set for home play by removing one wire. Coin door has coin mech present on one side, absent on the other side, and has the lock and key present. Game recognizes trip of the coin switch. The ball lift lever moves freely but doesn't quite engage the lift mechanism, needs some type of adjustment. Line cord has been replaced. I did not lift the playfield - a light tug upward on the apron didn't budge the playfield, and because I'm unfamiliar with the Gottliebs I wasn't sure if there was something securing the playfield that needed to be released before raising it, or it just needs a good tug to lift it free.
Any thoughts on valuation would be appreciated!