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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 most expensive, elaborate, and complicated of all the Cartier Tank watches is the Cartier Tank MC ref. W5310040 watch. The skeleton dial displays the 9619 MC, manual winding movement, and itâs bridges for the Roman numeral hour markers. The case is 18kt pink gold and it comes with a leather strap.