| Stop seconds Mechanism that stops the balance wheel and thus the movement of the seconds hand when the crown is pulled. This allows a watch to be precisely synchronised with an external time signal. |
| Tourbillon A watch equipped with an intricate rotating carriage containing the balance wheel in the middle adjacent to the escapement. The carriage rotates about its axis once a minute. It compensates for the effect of the earth's gravity and improves the accuracy of the watch. |
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