Useless fact
What is the small wheel on a watch called?
The small, ridged wheel on the side of a wristwatch used to set the time is called the crown.
The winding crown is one of the most recognizable components of a mechanical or quartz wristwatch, serving as the primary interface between the user and the internal movement. Historically, early portable timepieces did not have crowns; instead, they required a separate key to wind the mainspring and adjust the hands, much like a grandfather clock. The modern winding mechanism, operated by a built-in wheel, was pioneered in the mid-nineteenth century. French watchmaker Jean-Adrien Philippe, co-founder of the luxury brand Patek Philippe, is widely credited with inventing the modern crown-winding system in 1842. This innovation eliminated the need for a key, making watches significantly more dustproof and water-resistant. Today, while digital and smartwatch screens have reduced the crown's mechanical necessity, many models still retain a rotating button, often called a digital crown, to navigate menus and adjust settings. The crown remains an iconic design element, frequently adorned with a brand's logo or a precious gemstone.
Why this is true — The term 'crown' is the standard horological name for this component, as documented in major dictionaries and watchmaking guides.
Sources
- corona | Diccionario de la lengua española Real Academia Española