A new generation of Oyster Perpetual movements
At Baselworld 2015, some Rolex replica watches were inaugurated with a new generation of movements, the Cal. 32xx generation. These calibers feature improvements to more than 90% of the components, resulting in optimized precision and an increased power reserve of around three days or 70 hours, some 50% longer than previous movements. These new movements feature Rolex’s patented Chronergy escapement – an advanced version of the traditional Swiss lever escapement found in mechanical watches, with a more efficient skeletonized design. According to Rolex, modifications to the escapement’s design structure have increased its efficiency by 15%, paving the way for more power reserves and its nickel-phosphor construction that makes it resistant to magnetic interference. 
In the current generation of full-size replica Rolex Oyster Perpetual, the calendar-free equivalent of these movements, the 3230 caliber, which debuted in 2020, replaces the 3130 calibers. 3235 and 3230 calibers are virtually identical, the significant difference between them being that one has a date mechanism and the other does not. This powerhouse movement also drives most of Rolex’s other chronograph masterpieces, including the new Explorer 36, the Dateless Submariner, and the Air-King.
The most crucial difference is the Syloxi hairspring attached to the balance cock. Unlike the Parachrom hairspring attached at a single point, the Syloxi variant is fixed to the balance bridge at two points. This design offers better isochronism than the Parachrom hairspring and is completely antimagnetic since it is made of a silicon-based material. Caliber 3230 uses the Parachrom hairspring, while caliber 2232 Ladies is equipped with the Syloxi hairspring.
The early balance springs produced decades ago were far from today’s watch industry standards. They were very susceptible to weather changes and magnetic fields, as they were made of steel. Eventually, other changes followed, promising to provide better resistance to magnetism and temperature fluctuations. However, the modern hairspring as we know it today is a marvel of watchmaking, with unparalleled resistance to all the external influences that can affect a watch’s ability to keep perfect time.