I have deliberately kept quiet on this one and would ask why it was ever posted in the "Recommended Zenith" thread.
Last Saturday, I went to see this watch and whilst it is not the worst A386 I have seen, it has very few endearing qualities. OK, two. The dial is good and it checks out as a first series watch.
If you look closely at the photos, you will see that half of one of the screw heads on the rotating weight is broken off - this will be a really time consuming task to remove, before you even start to dismantle the movement. The chrono will not run for a full minute, so it is impossible to tell if the re-set works. The hands need replacing as does the tachy ring (as noted above) There are also other issues with the movement.
My guess is that the minimum the buyer will have to spend on it to make it half way decent is £1,500 without replacing the tachy ring and hands - if you can get them.
I would have been prepared to offer the seller £3,000 but I knew it would end up at £4 - 4.5 K
It is a big gamble for someone and I hope it pays off for them but watch out for 539D175.