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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.
As long as the watch is moving, it will have power. This is known as perpetual movement.. However, these perpetual watches can stop if they're left motionless for too long. If this happens to your Rolex, follow a few simple steps to wind it and reset the time and date.