Rolex Day-Date 228236-0012 40mm

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          Description

          Case
          Oyster (monobloc middle case, screw-down case back and winding crown)
          Diameter: 40 mm
          Material: 950 platinum
          Middle case: 950 platinum, polished finish
          Bezel: 950 platinum, fluted
          Case back: 950 platinum, solid, screw-down with fine fluting
          Winding crown: Twinlock in 950 platinum, screw-down, double waterproofness system
          Crystal: Scratch-resistant sapphire with anti-reflective coating; Cyclops lens over the date with double anti-reflective coating
          Waterproofness: 100 metres (330 feet)

          Movement
          Calibre 3255, Manufacture Rolex
          Mechanical movement with bidirectional self-winding via Perpetual rotor
          Precision: -2 /+2 sec./day, after casing
          Oscillator Frequency: 28,800 beats/hour (4 Hz)
          Paramagnetic blue Parachrom hairspring
          Rolex overcoil
          Large balance wheel with variable inertia
          High-precision regulating via four gold
          Microstella nuts
          Traversing Balance Bridge
          High-performance Paraflex shock absorbers
          Escapement: Chronergy with optimized energy efficiency
          Paramagnetic nickel-phosphorus pallet fork and escape wheel
          Jewelling: 31 rubies
          Power reserve: Approximately 70 hours

          Functions
          Centre hour, minute and seconds hands
          Instantaneous day and date in apertures at 12 and 3 o’clock with secure rapid-setting
          Stop-seconds for exact time setting