Monobloc middle case, screw-down case back and winding crown
Diameter
40 mm
Material
18 ct yellow gold
Bezel
Fixed, with engraved tachymetric scale, in 18 ct yellow gold
Winding crown
Screw-down, Triplock triple waterproofness system
Crystal
Scratch-resistant sapphire
Water resistance
Waterproof to 100 metres / 330 feet
Movement
Perpetual, mechanical chronograph, self-winding
Calibre
4131, manufacture Rolex
Precision
-2/+2 sec/day, after casing
Functions
Centre hour and minute hands, small seconds hand at 6 o'clock. Chronograph via centre seconds hand, 30-minute counter at 3 o'clock and 12-hour counter at 9 o'clock. Stop seconds for exact time setting
Oscillator
Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers
Winding
Bidirectional self-winding via Perpetual rotor
Power reserve
Approximately 72 hours
Bracelet
Oyster, three-piece solid links
Material
18 ct yellow gold
Clasp
Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link
