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Automatic watch. An automatic or self-winding watch is a mechanical watch in which the mainspring is wound automatically as a result of the natural motion of the wearer to provide energy to run the watch, making manual winding unnecessary. A mechanical watch which is neither self-winding nor electrically driven is called a manual watch. Most mechanical watches manufactured today are self-winding.
The first widely used chronograph watch function is tachymeter. If you have a chronograph, chances are tachymeter scale is on it. Itâs a scale which is usually printed on the bezel to let users know the speed of a moving object if they know the distance it traveled. A simple example is with F1 race.