The Rolex GMT-Master II is one sharp watch with the power of two time zones. Nowadays, your smartphone updates to the correct time once you turn off airplane mode upon hitting the runway – but for earlier jet-setters it took some serious mechanical advances in watchmaking to account for changes in time. This 4-hand self-winding Rolex pays homage to the those earlier days, and the blue GMT hand keeps 24-hour Greenwhich Mean Time while the standard hand keeps the local hour. The two-toned Cerachrom ceramic bezel is virtually scratchproof and rotates in both directions to quickly read the GMT hand in various time zones. A sophisticated mechanism allows the hour hand to be adjusted in hour increments without disturbing the time keeping of the minute and second hands (whereas in other watches the time would stop and all hands would move at once). While at first glance it may look just like a Rolex Submariner with a black and blue bezel (and to be fair, they are extremely similar in many ways), the complex dual-time movement in the GMT-Master is what sets it apart. Only downside is the $9,895 retail price.