With the push of a button the 24-hour rotatable disk can be turned forward or backward in one hour steps, depending on the position of the sophisticated switch mechanism. A third, neutral position prevents the display unintentionally being set to the wrong position. This construction results in fast and precise wheel movement as well as great ease of use, since the pushbutton can be operated without having to remove the watch from the wrist. The diamond plasma-treated surfaces of the switches are hardened to an incredible 5000 Vickers. A system of such sophistication is extremely durable, ensuring low wear-and-tear and meaning there are absolutely no maintenance requirements. This timepiece is therefore not only guaranteed to function smoothly, it will also serve the demanding watch-lover well throughout its long life.