<P> 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 . </P> <P> In a mechanical watch the watch's gears are turned by a spiral spring called a mainspring . In a manual watch energy is stored in the mainspring by turning a knob, the crown on the side of the watch, winding the mainspring . Then the energy from the mainspring powers the watch movement until it runs down, requiring the spring to be wound again . </P>

What does automatic movement in a watch mean
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