If Datejust, Day-Date, Cellini have been considered as formal watches, then Daytona, GMT-Master, Submariner, Sea-Dweller, Yacht-Master, Explorer, Milgauss and Air-King should be considered as professional watches. But you are obliged to admit the fact that these perfect fake Rolex watches are much more popular than those formal watches.
Today I will talk about GMT firstly in particular. The reason why many people chose Submariner instead of GMT before was that it was not available to get the Submariner. But now the condition changed when Federer wore the GMT when he was awarded the trophy on award ceremony in 2017. What he wore was a blue and red ceramic bezel copy Rolex GMT-Master II.
The second one is the steel Daytona. Now if you want to buy the Oystersteel case imitation watch with official price, I should tell that it is impossible now. I think everyone knows the reason without any explanation.