Rider tabs are small markers, often decorative in nature, typically placed on the bezel or edge of a watch case that are used to indicate elapsed time or other timekeeping functions. They can be used to measure intervals, useful, in certain applications, where precise time measurement is crucial, such as in sports, aviation, or diving. Rider tabs may also be purely aesthetically functional; they have elements of visual appeal and enrich the general appearance of the watch. By allowing a user to accurately measure time, rider tabs make the watch functionally and versatile, thus easing the execution of specific tasks with ease.
The rotor feature is an example of form and function, especially in high-quality watchmaking. It is therefore, is a semi-circular weight located in the heart of the automatic watch. It was the mechanism that wound the mainspring through the movements of the wearer's wrist.