| Specifications: | |
| Brande: | Rolex |
| Model: | Day-Date 40 |
| Reference Number: | 228348rbr-0001 |
| CASE | |
| Case Diameter | 40 mm |
| Oyster Architecture | Monobloc middle case. screw-down case back and winding crown |
| Case Material | 18 kt yellow gold |
| Crystal | Scratch-resistant sapphire. Cyclops lens over the date |
| Bezel | Set with diamonds |
| Winding crown | Screw-down. Twinlock double waterproofness system |
| Water Resistance | Waterproof to 100 metres / 330 feet |
| Clasp | Folding clasp |
| DIAL | |
| Dial Color | Bright black |
| Gem settings | |
| BRACELET | |
| Band Name | President. semi-circular three-piece links |
| Band Material | 18 kt yellow gold |
| Clasp | Concealed folding Crownclasp |
| MOVEMENT | |
| Movement | Perpetual. mechanical. self-winding |
| Calibre | 3255. Manufacture Rolex |
| Precision | -2/+2 sec/day. after casing |
| Functions | Centre hour. minute and seconds hands. Instantaneous day and date in apertures. secure rapid-setting. Stop-seconds for exact time setting |
| Oscillator | Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers |
| Winding | Bidirectional self-winding via Perpetual rotor |
| Power reserve | Approximately 70 hours |
| Certification | Superlative Chronometer (COSC + Rolex certification after casing) |
