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The date is a small window on the dial which indicates the day of the month (between 1 and 31).
The central second is the central hand of the dial which divides the minute into 60 units.
Watches featuring a GMT complication (which stands for Greenwich Mean Time) can display a second time zone thanks to an additional hand. They are much appreciated by travelers and airline pilots.
Divers offer a better waterproofness than traditional watches. They are equipped with a graduated rotative bezel in order to calculate diving time and they also feature a better luminescence.