Quick and dirty list:
Nr. 1 hint : Rehaut (not deep enough?)
Nr. 2 hint : Crystal (does not have a high enough lip from the bezel?)
Nr. 3 hint : Dial (not enough strong print clear letters?)
Nr. 4 hint : Crown (too big? not sharp enough?)
Nr. 5 hint : Laser etched crown @6 (visible by naked eye?)
Nr. 6 hint : Bezel edge (Sharp?)
If you answer YES,YES,YES,YES,YES,YES you have seen a replica and a bad one at that...
For me the quickest hint to know if somebody is wearing a rep Sub is to check the rehaut which is always visible at most angles.....never failed before...
(from 1 meter the latest "ultimate" subs do have enough rehaut to pass as gen like..) Checked it last evening with a friend who weras a gen pre93 sub and me my TTK asian latest sub.