The original $59k selling price seems to be the area that most numbers matching Z's that are decently restored are going for among private parties. In this case the color didn't seem to have any affect. It will be interesting to see if a bidding frenzy jacks up the price at all, but that won't really reflect real world private party prices in most peoples opinions.
I've said it before, that's why I think people selling Z's and wanting $35k or more for a car that needs another $40k worth of restoration work are out of their minds when you can buy a nicely done numbers matching car in the $50-$65k range (not necessarily concours, but nice) and this car was just one example.