Hi there i myself have a carrera like yours, but the black and red version, i really like the watch but a few issues
1.- stop working 3 days after i receive it, as i read before, A7750 almost all the times needs service just after you receive it from the dealer
2.- Movt tricky, not usually known by the common watchsmith
3.- mine has to spend like 2 weeks in the watchsmith before he could understand, clean, lubricate, calibrate etc, the watch (it depends on the knowledge of the WS)
4.- Once you do that works great
ps don't think its a screw down crown