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Technical Specifications - Oyster Perpetual Datejust 31
Case reference: 278274
Bracelet reference: 72360 Oyster
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
• 31 mm
Material
• Oystersteel and white gold (white Rolesor)
Middle case
• Oystersteel, polished finish
Bezel
• White gold, fluted
Case back
• Oystersteel, solid, screw-down with fine fluting
Winding crown
• Twinlock in Oystersteel, 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 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 (4 Hz)
• 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 escape wheel
Jewelling
• 31 rubies
Power reserve
• Approximately 55 hours
Dial
• Azzurro blue, gloss, floral motif
• 24 diamonds in 18 ct white-gold settings
• Hands in 18 ct white gold
Bracelet
• Oyster, three-piece solid links
• Oystersteel, polished centre links, satin-finished outer links with polished edges
• Folding Oysterclasp
• Easylink comfort extension link (approx. 5 mm)
