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Technical Specification - Oyster Perpetual air-king
Case reference: 126900
Bracelet reference: 78JB20 Oyster
Category: Oyster Perpetual Professional
Certification: Superlative Chronometer (COSC + Rolex certification after casing)
International five-year guarantee
Case
• Oyster (monobloc middle case, screw-down case back and winding crown)
Safety
• Integral crown guard
Diameter
• 40 mm
Material
• Oystersteel
Middle case
• Oystersteel, satin finish with polished sides
Bezel
• Oystersteel, smooth
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
Waterproofness
• 100 metres (330 feet)
Movement
• Calibre 3230, 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
• Stop-seconds for exact time setting
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
Dial
• Black lacquer
• 3, 6, 9 in 18 ct white gold, highly legible
Chromalight (long-lasting luminescence, blue glow)
• White transferred minutes numerals
• Triangular hour marker in 18 ct white gold at 12 o’clock, highly legible Chromalight (long-lasting luminescence, blue glow)
• Hands in 18 ct white gold, green lacquer seconds hand, highly legible Chromalight (long-lasting luminescence, blue glow)
Bracelet
• Oyster, three-piece solid links
• Oystersteel, satin finish with polished edges
• Oysterlock folding safety clasp
• Easylink comfort extension link (approx. 5 mm)
