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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.
There are not that many mechanical watch movement producers in Japan, The big three watch brands there are Casio, Citizen, and Seiko - and Casio is strictly quartz. Citizen owns the movement maker Miyota, which makes movements for mechanical Citizen watches but also sells movements to third party brands.