AUTOMATIC

A watch is described as automatic when its Mainspring winds through the movements of the wearer, without regular manual winding. The mechanism relies on an Oscillating weight (rotor) that pivots freely around its axis under the effect of gravity and wrist movements; via a Reverser and a Train (wheel train) reduction gear, its oscillations progressively wind the spring. Invented in the 18th century and then widespread in the 20th century with the oscillating weight pivoting a full 360°, automatic winding offers the wearer great ease of use: as long as they wear the watch, it stays wound. A slipping mechanism (bridle) prevents over-Winding of the spring. An automatic watch has a Power reserve, which allows it to continue running for a certain Time without being worn. This system now equips the majority of mechanical watches; its Mass oscillating weight, often visible through a Case back that is transparent, is frequently openworked, decorated and personalized with the brand’s colors.