On all genuine Rolex GMT-Master II watches the two hour hands will be independently adjustable, and the 12-hour hand can be jumped forwards or backwards in 1-hour increments. One of the best ways to tell if a GMT-Master II is real is to look for this jump-hour feature. Other things you should always look out for are overall quality of the details. Rolex GMT-Master II watches are some of the finest timepieces available and they should look like it.