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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.
So all automatic watches are equipped with a gear that disengages when the spring is fully wound. The advantage is that it makes it impossible to manually overwind an automatic watch. The disadvantage is that you loose the feedback of when you have wound your automatic watch enough.espite that, many modern watches can be reversed with no problem. But it is best to check with the manufacturer to be sure. The one general rule is that if your mechanical watch's second hand does not stop when you put the watch in time setting mode, then you should definitely not turn the hands backwards.