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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.
Regulators don’t have their hands on the same axis. The minute hand becomes the principal hand whereas the hour hand is situated on a smaller subcounter.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.