A Swiss mechanical movement, also known as a caliber, does not expect a battery to function like a Japanese mechanical watches movement does; it uses energy from a wound-up mainspring instead. A barrel transports the power from the mainspring. The two main types of mechanical movements are automatic and manual. As its name implies, a manual caliber requires the wearer to manually wind the outside crown, which in turn winds the mainspring that is inner. An automatic movement gathers energy to end the mainspring via the action of a wearer’s wrist up. What Movements Can Rolex Use? Rolex watch motions have been prized as being some of the most dependable calibers and are a significant part of Rolex is the number one manufacturer in luxury watches. In 2015, Rolex enhanced the omnipresent Swiss lever escapement — that the component in a caliber accountable for taming the energy in the coiled mainspring and the source of an eye’s”tick-tock” sound — also introduced their proprietary Chronergy escapement to Caliber 3255, which boasts a 15% increase in efficiency, thus improving the watch’s power-reserve. In precisely the same year, Rolex redefined their Superlative Certification, guaranteeing the accuracy of the calibers into +2/-2 seconds per day — double the need for an chronometer.