Reference
278240
Model case
Oyster, 31 mm, Oystersteel
Bezel
Domed
Water resistance
Waterproof to 100 metres / 330 feet
Movement
Perpetual, mechanical, self-winding
Calibre
2236, Manufacture Rolex
Power reserve
Approximately 55 hours
Bracelet
Jubilee, five-piece links
Dial
Bright blue
Certification
Superlative Chronometer (official chronometer certification + Rolex certification after casing)