I have two of these now, one gen but (the doppler chronograph), and because it's such a great watch expensive as i got a rep as daily beater. It's like taking my ferrari to go shopping, you just don't like doing it. My rep 3717 has a gen movement and double AR. It's verry close to a gen. I got the watch of Concepta, not the most communicative lad and you need to chase him up but he delivers. He got me rep 31717 with gen a movement and it runs 0,5sec fast a day, that's impressive.
One tell tell on the rep is the crown, if there is something you want to mod, then it's the crown. I can spot a fake 3717 from a mile away