I wonder why many say it is to big. I have a very small wrist 18,5 cm and it fits well.
I´m owner of a rare prototype modell of the Royal Kontiki Date, but it has the same size of the "GMT".
The design of this watch is a homage to the 1976 Royal Quartz Kontiki, and not to a IWC Ingenieur.
I think more important is the lug to lug size, than the real diameter of the watch.