Source: Images and content by Rolex. See the original article here - https://newsroom.rolex.com/watches/new-watches-2020/sky-dweller
A WEALTH OF EXPERTISE
An elegant watch for frequent travellers, the Sky-Dweller displays the time in two time zones simultaneously and has an annual calendar. The reference time, in 24-hour format, is shown via an off-centre disc, and the local time is read using conventional centre hands. The annual calendar, named Saros, automatically differentiates between 30- and 31-day months. It is operated by a patented mechanism and stands out for its innovative display: the months of the year are indicated in 12 apertures around the circumference of the dial, with the current month marked in red. The instantaneous date change is linked to the local time.
The Sky-Dweller includes the Ring Command system, an interface between the rotatable bezel, winding crown and movement that allows the wearer to select and set the timepiece’s functions one by one, easily, quickly and securely.
THE OYSTER CASE, SYMBOL OF WATERPROOFNESS
A paragon of robustness and reliability, the Oyster case of the Sky-Dweller is guaranteed waterproof to a depth of 100 metres (330 feet). The middle case is crafted from a solid piece of 18 ct yellow gold. The case back, edged with fine fluting, is hermetically screwed down with a special tool that allows only Rolex watchmakers to access the movement. The Twinlock winding crown, fitted with a double waterproofness system, screws down securely against the case. The crystal is made of virtually scratchproof sapphire and is fitted with a Cyclops lens at 3 o’clock for easy reading of the date. The waterproof Oyster case provides optimum protection for the watch’s movement.
PERPETUAL CALIBRE 9001
This new version of the Sky-Dweller is equipped with calibre 9001, a movement entirely developed and manufactured by Rolex. With multiple patents filed, this mechanical, self-winding movement is one of the most complex calibres created by the brand. Its architecture, manufacturing and innovative features make it exceptionally precise and reliable.
Calibre 9001 has a blue Parachrom hairspring manufactured by Rolex in an exclusive paramagnetic alloy that makes it up to 10 times more precise than a traditional hairspring in case of shocks. The blue Parachrom hairspring is equipped with a Rolex overcoil, ensuring the calibre’s regularity in any position. The oscillator is fitted on the Rolex-designed and -patented high-performance Paraflex shock absorbers, increasing the movement’s shock resistance.
Calibre 9001 is equipped with a self-winding module via a Perpetual rotor and offers a power reserve of approximately 72 hours.