Reference 178243 is the Rolex Datejust 31, in Oystersteel and 18k yellow gold. This steel-and-gold combination is called Rolesor. The date shows in a window at 3 o'clock under a Cyclops lens.
The 31mm case has a polished domed bezel. The champagne dial has applied index hour markers. The watch is worn on a three-piece-link Oyster bracelet.
It runs on the in-house Rolex caliber 2235, with a power reserve of about 48 hours when fully wound. It is an officially certified chronometer, tested by COSC for accuracy. A screw-down crown and a sapphire crystal make it water resistant to 100 meters.
- Reference
- 178243
- Case
- 31mm Oystersteel and 18k yellow gold
- Bezel
- Domed
- Dial
- Champagne index dial with applied index hour markers
- Crystal
- Sapphire, with Cyclops lens over the date
- Crown
- Screw-down
- Bracelet
- Oyster, three-piece links
- Movement
- Rolex caliber 2235, self-winding
- Power reserve
- About 48 hours
- Functions
- Hours, minutes, seconds, date
- Certification
- Chronometer, COSC tested
- Water resistance
- 100 m / 330 ft