Rolex · Reference archive
Day-Date 40 Yellow Gold / Diamond / Black Baguette
REF 228348RBR-0001
Introduced at BaselWorld 2015, the Day-Date 40 leads in a new era in the history of this Rolex icon. Its case is noticeably bigger than the classic DD, yet slightly smaller than the Day-Date II. It is powered by the highly innovative caliber 3255. The present example has a yellow gold case with diamond bezel and a black dial with baguette-cut diamond markers.
Overview
| Reference | 228348rbr-0001 |
|---|---|
| Produced | 2015 |
| Limited edition | no |
Case
| Case material | Yellow gold |
|---|---|
| Case shape | Round |
| Case diameter | 40.00 mm |
| Lug width | 20.00 mm |
| Crystal | Sapphire |
| Bezel | Gem-Set |
| Case back | Closed |
| Water resistance | 100.00 m |
Dial
| Dial color | Black |
|---|---|
| Index type | Diamond |
| Hand style | Stick |
| Hands | Hours, Minutes, Seconds |
| Calendar | Date, Day |
| Display | Analog |
| Additional features | Chronometer |
Movement
| Caliber | 3255 |
|---|---|
| Base caliber | Rolex 3035 |
| Movement type | Automatic |
| Frequency | 28800 bph |
| Jewels | 31 |
| Power reserve | 70 h |
| Movement diameter | 28.50 mm |
Caliber Notes
Calibre 3255’s criteria for precision in everyday wear are twice as exacting as those for an officially certified chronometer. It incorporates the new Chronergy escapement patented by Rolex, which combines high energy efficiency with great dependability. Made of nickel‑phosphorus, it is also insensitive to magnetic interference. The oscillator, the true heart of the watch, has an optimized blue Parachrom hairspring, which is also up to 10 times more precise than a traditional hairspring in case of shocks. Thanks to a new barrel architecture and the escapement’s superior efficiency, the power reserve of calibre 3255 extends to three days. This means the watch will easily continue to run from Friday evening into Monday afternoon even if not worn or wound.
More Data
| Brand | Rolex |
|---|
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