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Technical Specs:
| Brand: | Rolex |
| Model: | Datejust 31 |
| Reference Number: | 278240-0005/0006 |
| CASE | |
| Case Shape | Round |
| Case Dimensions | 31 mm |
| Oyster Architecture | Monobloc middle case, screw-down case back and winding crown |
| Crystal | Scratch-resistant sapphire, Cyclops lens over the date |
| Bezel | Domed |
| Winding Crown | Screw-down, Twinlock double waterproofness system |
| Water Resistance | Waterproof to 100 metres / 330 feet |
| Case Material | Oystersteel |
| DIAL | |
| Dial Color | Silver |
| Details | Highly legible Chromalight display with long-lasting blue luminescence |
| BRACELET | |
| Band Material | Oystersteel |
| Band Name | Oyster, three-piece solid links / Jubilee, five-piece links |
| Clasp | Folding Oysterclasp with Easylink 5 mm comfort extension link |
| MOVEMENT | |
| Movement Type | Perpetual, mechanical, self-winding |
| Calibre | 2236, Manufacture Rolex |
| Precision | -2/ 2 sec/day, after casing |
| Functions | Centre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting |
| Oscillator | Syloxi hairspring in silicon with patented geometry. High-performance Paraflex shock absorbers |
| Winding | Bidirectional self-winding via Perpetual rotor |
| Power Reserve | Approximately 55 hours |
| COSC Certified | Superlative Chronometer (COSC Rolex certification after casing) |