The difference is that a travelers-GMT features an independently adjustable hour hand, making it possible to first set the 24-h hand on home time and while traveling through different timezones, you can adjust the hour hand. replicawatches The hour hand can be adjusted in one-hour steps (IWC calls this TZC, or Time Zone Corrector), just like on a Rolex GMT-Master II. The 24-h hand will keep indicating the home time with its 24-h hand, so you ll also know whether your loved ones at home are asleep or not. To make it easier to differentiate between day and night, the top half, from 6 p.m. to 6 a.m., is darker than the lower half.