Hi, the model below is one of the very best IWC replicas, and as far as I know the best replicas are ZF (which the one below is). The way to check replicas vs. gen is to get pictures from the manufacturer site (in this case IWC) and pictures from the best TDs and comapre them side by side. This way you will form your own opinion about that. And it takes a lot of time, also for the other members to do that.
Three hints are: Check carefully the back of the IWCs. For models with transparent back case, there is were the difference between different factories is enormous (with ZF being by far the best in m y opinion).
Hint no.2 be carefully to go for white dial and silver hands. I have that (see below) and in many light situations it is very difficult to read the time.
Hint no.3 for watches with the 7 days vharge, just forget it. It is more like 48 hours. There are no reps with so long charge time. But the display works "proportionally" fine.