An automatic movement is a mechanical watch movement that is wound by the motion of the wearer’s wrist. The rotor pivots freely around a spindle, and a movement in either direction helps to rewind the mainspring. The watch is regulated by a spiral balance wheel that vibrates 6-8 times a second. An automatic movement is composed of more than 70 parts (up to 230 parts for the Calibre 360). While it is slightly less precise than a quartz movement (by a few minutes per month), it is the ultimate example of Swiss watchmaking expertise and tradition.
In the great tradition of Swiss watchmaking, all TAG Heuer automatic movements are made in Switzerland, and meet extremely strict criteria for precision.
Their high frequency (ranging from 21,600 vibrations per hour to 36,000 in the Calibre 36 model and as many as 360,000 in the Calibre 360) ensures excellent mechanical precision.
A number of TAG Heuer automatic movements are awarded an Official Swiss Chronometer Control (C.O.S.C.) Certificate, the ultimate recognition of precision and reliability.
TAG Heuer automatic movements have a power reserve of about 42–48 hours, depending on the model. This means that when they are fully wound they can continue to operate for almost two days and nights without being worn. The mainspring can also be rewound manually using the crown unscrewed and pulled out to position 1 (avoid using force). Note: do not forget to screw the crown down again in position 0.
As with every micro-mechanism that operates continuously, an automatic watch movement requires regular maintenance. With proper care, it will work perfectly and last for generations. TAG Heuer recommends a maintenance service every two years as well as an annual water-resistance check. A one-year extension warranty on the work carried out is given to all watches that are maintained by an official TAG Heuer Service Center.