Like all clocks with an annual calendar, the Sky-Dweller automatically distinguishes between 30-day and 31-day months. Always give the correct date and it is only necessary to adjust it once a year: March 1, since the month of February has 28 or 29 days, depending on whether it is a leap.
The months of the year are discreetly indicated by twelve small windows on the contour of the dial, circling the hour indices: January at 1 o’clock, February at 2 o’clock, etc. The current month is indicated in red.
One of the most revolutionary features of the watch, however, is the system devised to manipulate the different functions, the Ring Command. This mechanism of interaction between the movement and the case, developed and patented by Rolex, allows the user of the watch to select the function to be adjusted – calendar (day and month), local time or reference time – by turning the fluted bezel one, two or three notches respectively (counterclockwise). A) Yes, the chosen function can be quickly adjusted in one direction or the other thanks to the rope crown —Which only has one position of correction— and without any restriction.
It integrates the caliber 9001, a movement with 72 hours of power reserve that is also found among the most complicated developed by Rolex. Your oscillator features a blue Parachrom coil made from a unique alloy. Completely insensitive to magnetic fields, it offers great stability against temperature variations and is up to ten times more precise than a conventional spiral in case of impacts.
Like all new watches from the manufacture, it has the certificate of Superlative Stopwatch. This designation attests that each of the watches, after fitting, has successfully passed a series of Specific final checks carried out by Rolex in its own laboratories.
The tolerance criteria are much stricter than those of the COSC with regard to the average gait deviation, since this should not exceed –2 / + 2 seconds per day after fitting, compared to the –4 / + 6 seconds per day required by the other certification.