Case model: 126529 LN
Bracelet model: 78HA09 Oyster
Category: Oyster Perpetual Professional

Case

• Oyster case (monobloc middle case, screw-down case back
and winding crown and buttons)
Safety features
• Crown guards integrated into the middle case
Material
• 18K white gold
Middle case
• 18K white gold, polished
Bezel
• Monobloc black Cerachrom ceramic bezel with 18K white gold inlay, featuring a tachymetric scale; moulded graduations and numerals plated with platinum using PVD (Physical Vapour Deposition) coating technology; red ceramic numeral “100”
• Case back
• 18K white gold, anti-reflective blue crystal glass
• Screw-down, finely fluted
Winding crown
• 18K white gold, screw-down, with Triplock triple waterproofing system
Crystal
• Scratch-resistant and anti-reflective blue crystal
Water resistance

• 100 metres (330 feet)

Movement

• Rolex Calibre 4132
• Mechanical chronograph movement with column wheel and vertical clutch
• Self-winding via Perpetual rotor in both directions
• Rolex Geneva stripes
• 18K gold rotor
Precision
• Within -2/+2 seconds per day (after the movement is cased)
Functions
• Central hour and minute hands; small seconds sub-dial at 6 o’clock
• Central chronograph seconds hand
• 30-minute chronograph sub-dial at 3 o’clock, 24-hour sub-dial at 9 o’clock
• Seconds-stop function for precise time setting
Balance and hairspring assembly
• Frequency: 28,800 vibrations per hour (4 Hz)
• Paramagnetic blue Parachrom hairspring
• Rolex overcoil
• Large-inertia adjustable balance wheel
• Four gold adjustment nuts for precise time regulation
• Balance bridge
• High-performance Paraflex shock absorbers
Escapement
• High-efficiency Chronergy escapement
• Paramagnetic nickel-phosphorus alloy pallet fork and escape wheel
Oyster, three-piece solid links