Lady-Datejust 279136 RBR

Lady-Datejust 279136 RBR

CATEGORYOyster Perpetual Classic
CertificationSuperlative Chronometer (COSC + Rolex certification after casing), international five-year guarantee
CaseOyster (monobloc middle case, screw-down case back and winding crown)
Diameter28mm
Material950 platinum
Middle Case950 platinum, polished finish
Bezel950 platinum set with 44 brilliant-cut diamonds (approx. 0.86 ct)
Case backSolid, screw down with fine fluting
Winding CrownScrew-down; Twinlock double waterproofness system
CrystalScratch-resistant sapphire
Cyclops lens over the date with double anti-reflective coating
Waterproofness100 metres (330 feet)
Movement
Calibre2236, Manufacture Rolex
Mechanical movement with bidirectional self-winding via Perpetual rotor
Precision-2/+2 sec./day, after casing
FunctionsCentre hour, minute and seconds hands
Instantaneous date at 3 o’clock with secure rapid-setting
Stop-seconds for exact time setting
OscillatorFrequency: 28,800 beats/hour (4Hz)
Syloxi hairspring in silicon with patented geometry
Balance wheel with variable inertia
High-precision regulating via two gold Microstella nuts
Traversing balance bridge
High-performance Paraflex shock absorbers
EscapementParamagnetic nickel-phosphorus pallet fork and escape wheel
Jewelling31 rubies
Power ReserveApproximately 55 hours
Dial
ColourIce blue, gloss, sunray finish
Hour MarkersAppliques in 18 ct white gold set with 36 diamonds, and Roman numeral IX in 18 ct white gold set with 8 diamonds
Hands18 ct white gold
Bracelet
TypePresident, three-piece solid links
Material950 platinum, polished centre links, satin-finished outer links with polished edges, ceramic inserts
ClaspConcealed folding Crownclasp

Featured image ©Rolex