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The tourbillon system was made to compensate the Earth’s gravitational force by mounting the escapement in a revolving cage. It gives the watch a better accuracy. This complication is known as one of the most difficult to make.
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.
The 24H indicator is often associated with watches displaying several time zones.
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.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.