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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.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.
The night and day indicator is an aesthetic complication which displays on the dial the movement of the sun and the moon. This complication must not be confused with the moonphase.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).