Lady-Datejust 279173
| CATEGORY | Oyster Perpetual Classic |
| Certification | Superlative Chronometer (COSC + Rolex certification after casing), international five-year guarantee |
| Case | Oyster (monobloc middle case, screw-down case back and winding crown) |
| Diameter | 28mm |
| Material | Oystersteel and 18 ct yellow gold (yellow Rolesor) |
| Middle Case | Oystersteel, polished finish |
| Bezel | 18 ct yellow gold, fluted |
| Case back | Solid, screw down with fine fluting |
| Winding Crown | Screw-down; Twinlock double waterproofness system |
| Crystal | Scratch-resistant sapphire Cyclops lens over the date with double anti-reflective coating |
| Waterproofness | 100 metres (330 feet) |
| Movement | |
| Calibre | 2236, Manufacture Rolex Mechanical movement with bidirectional self-winding via Perpetual rotor |
| Precision | -2/+2 sec./day, after casing |
| Functions | Centre hour, minute and seconds hands Instantaneous date at 3 o’clock with secure rapid-setting Stop-seconds for exact time setting |
| Oscillator | Frequency: 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 |
| Escapement | Paramagnetic nickel-phosphorus pallet fork and escape wheel |
| Jewelling | 31 rubies |
| Power Reserve | Approximately 55 hours |
| Dial | |
| Colour | Champagne-colour, gloss, sunray finish |
| Hour Markers | 10 diamonds in 18 ct yellow gold settings |
| Hands | 18 ct yellow gold |
| Bracelet | |
| Type | Jubilee, five-piece solid links |
| Material | Polished centre links in 18 ct yellow gold, satin-finished outer links in Oystersteel with polished edges (yellow Rolesor) |
| Clasp | Concealed folding Crownclasp |
Featured image ©Rolex