A crown guard is a protective feature on a watch designed to shield the crown from impacts and potential damage. It is an extension of the watch case that surrounds the crown, ensuring it remains secure and less prone to accidental knocks. This feature is particularly important for dive watches and other tool watches, where durability and reliability are crucial. The crown guard helps maintain the integrity of the watch's water resistance and overall functionality by preventing the crown from being inadvertently pulled out or damaged. Introduced by brands like Rolex in models such as the Submariner and GMT-Master, crown guards have become a standard design element in many professional and sports watches, enhancing both their aesthetic appeal and practical utility.