ST

The dead seconds is a hand that jumps forward when the second has elapsed. Generally the jump of the second hand is a distinctive feature of a quartz watch but in mechanical watchmaking, this function is a technical feat.

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.

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.