Everything depends on the price... I would say fair value by looking at the pics should be around 4500 to 5000. Everything looks nice but make sure everything clean under the play field and make sure the boards are in good condition. Also remember there's over 15,000 of these pins made compared to other games in the top 5 which are all under 5,000. So the value is not going to raise as much like MM and AFM did in the last couple years.
I have a TZ and I play it all most every day... Its good pin to have .. I feel lucky and fortunate to be able to own one.