Yacht-Master II
| CATEGORY | Oyster Perpetual Professional |
| Certification | Superlative Chronometer (COSC + Rolex certification after casing) |
| Case | Oyster (monobloc middle case, screw-down case back and winding crown) |
| Diameter | 44mm |
| Material | Oystersteel, satin and polished finish |
| Middle Case | Oystersteel, satin finish with polished sides |
| Bezel | Oystersteel, bidirectional 90° rotatable Ring Command Cerachrom insert in blue ceramic with moulded inscription and numerals, coated with platinum via PVD (Physical Vapour Deposition) |
| Case back | Solid, screw down with fine fluting |
| Winding Crown | Screw-down; Triplock triple waterproofness system |
| Crystal | Scratch-resistant sapphire |
| Waterproofness | 100 metres (330 feet) |
| Movement | |
| Calibre | 4161, Manufacture Rolex Mechanical movement with bidirectional self-winding via Perpetual rotor |
| Precision | -2/+2 sec./day, after casing |
| Functions | Centre, hour, minute and seconds hands, small seconds at 6 o’clock Programmable regatta countdown with mechanical memory, retrograde minute hand, on-the-fly synchronization of the countdown seconds and minute hands Stop-seconds for exact time setting |
| Oscillator | Frequency: 28,800 beats/hour (4Hz) Paramagnetic blue Parachrom hairspring Rolex overcoil Large balance wheel with variable inertia High-precision regulating via four gold Microstella nuts Traversing balance bridge |
| Jewelling | 42 rubies |
| Power Reserve | Approximately 72 hours |
| Dial | |
| Colour | White lacquer, blue small seconds counter |
| Hour Markers | Highly legible Chromalight appliques (long-lasting luminescence, blue glow) in 18 ct white gold |
| Hands | 18 ct white gold, highly legible Chromalight (long-lasting luminescence, blue glow) |
| Bracelet | |
| Type | Oyster, three-piece solid links |
| Material | Oystersteel, polished centre links, satin-finished outer links with polished edges |
| Clasp | Oysterlock folding safety clasp Easylink 5 mm comfort extension link |
Featured image ©Rolex
