When your watch is serviced by Rolex, the watch is completely dismantled and all of its components are ultrasonically cleaned. Each individual component is closely examined and those that no longer meet Rolex’s functional and aesthetic specifications are replaced with genuine Rolex parts. The movement is carefully lubricated then electronically tested to guarantee its timing accuracy; the case and the metal bracelet are meticulously refinished to restore their lustre. Your Rolex then undergoes a series of rigorous technical tests and checks to guarantee its waterproofness, power reserve and precision. After a complete Rolex service, your watch is covered by a service guarantee.