Reference
126503
Model case
Oyster, 40 mm, Oystersteel and yellow gold
Bezel
Fixed, with engraved tachymetric scale, in yellow gold
Water resistance
Waterproof to 100 metres / 330 feet
Movement
Perpetual, mechanical chronograph, self-winding
Calibre
4131, manufacture Rolex
Power reserve
Approximately 72 hours
Bracelet
Oyster, three-piece solid links
Dial
White, golden counter rings
Certification
Superlative Chronometer (official chronometer certification + Rolex certification after casing)