There are many shapes and sizes of sports watches. While I may prefer a good dive watch or the old-school charm of a racing chronograph, as for me a solid GMT is the best and nothing can beyond it. I suppose there is something particular about GMTs, about their ethos, their simple but powerful functionality, and their ability to ground you in your roots while adapting to anywhere you want to go in your life. Tudor declared the Black Bay GMT in March at Baselworld, a smart stainless steel travel watch based on the format established by their Black Bay dive watches, with true GMT functionality as well. Following the Pepsi-colored bezel established by Tudor's sibling brand Rolex, the Black Bay GMT is rather a new style for Tudor, but one that is recognizable both for its general Black Bay roots and for its aesthetic and functional similarities to one of the all-time great travel replica watches, the Rolex GMT-Master II.  With a strong value proposition, perfect design, and a new movement offering true GMT functionality well, the Black Bay GMT has become a classical port watch for the crazy traveler. Tudor has never really produced anything that could be considered a true precursor to the Black Bay GMT before. Of course, they've produced some GMT watches in their history, and even fitted the Heritage Chronograph with a smart 12-hour bezel, but the Black Bay GMT is unique among their product legacy and not according to any specific Tudor reference or model during the production. If we zoom out just a little, we find Tudor's older brother, Rolex, who do produce a very similar watch in the GMT-Master II. Originally announced the reference 16760 in 1983, the GMT-Master II built upon the travel-ready appeal of the original GMT-Master that Rolex developed for Pan Am pilots in the mid-1950s. Rolex created the model around a new movement that offered local jumping hours for GMT-Master II. So when you landed in a new time zone, you could change the local time in either direction by jump-setting the hour hand through the crown. This functionality also included the ability to progress or retract the date (If you fly through midnight), and the whole process could be done without stopping the replica watch or even disrupting the position of the other hands. If you fly a lot, this functionality will be upgraded. As we all know, the GMT-Master has offered a 24-hour bezel in a split blue/red color scheme that enthusiasts call a "Pepsi" bezel since its inception as reference 6542. At the same time, other colors have been offered, including red/black which is called a "Coke" bezel. The split colors help to describe day/night in the second time zone, and the color scheme has become one of the most noticeable visual design cues of the GMT-Master and GMT-Master II. While there was a brief pause while Rolex developed the ability to produce a red/blue Cerachrom bezel (their application of a ceramic bezel insert), the white gold reference 116719 with the Pepsi look returned to the line up at Baselworld 2014.