Hi,
watch you have on TZ link is not 3717, but older fliegerchrono version (3706). It has smaller case than watches from 3717 line.
I don't think there are any PVD watches in current filegerchrono line, they substituted it with ceramic.
Angus did have one fantasy model in PVD few days ago - 3717 case PVD-ed, TopGun-like dial, wrong crown, no AR - but despite that very nice watch. But he said there is just one piece available, so I'm not sure if it is still available.
As for buying 3717, I think all collectors have similar model, you just need to check if it has new A7750 movement - OR if you want to swap movement with genuine ETA/Val 7750, you should look for old A7750, because it will make swap much easier.
regards