The Rolex Datejust 31 in Oystersteel and 18k white gold is reference 278274. The 31mm case combines steel and gold in the finish Rolex calls Rolesor. The dark grey dial has Roman numerals and is surrounded by a fluted 18k white gold bezel.
The date shows in a window at 3 o'clock under a Cyclops lens. The watch is worn on a three-piece-link Oyster bracelet.
It is powered by the self-winding Rolex caliber 2236, with a power reserve of about 55 hours. The movement is tested as a Superlative Chronometer and is accurate to within −2/+2 seconds a day. A screw-down crown and a sapphire crystal keep it water resistant to 100 meters.
- Reference
- 278274
- Case
- 31mm, Oystersteel and 18k white gold
- Bezel
- Fluted, 18k white gold
- Dial
- Dark grey, Roman numerals
- Crystal
- Sapphire
- Bracelet
- Oyster, three-piece links
- Movement
- Self-winding Rolex caliber 2236
- Power reserve
- About 55 hours
- Accuracy
- −2/+2 seconds a day (Superlative Chronometer)
- Functions
- Hours, minutes, seconds, date
- Water resistance
- 100 m / 330 ft