The main advantage of a 24-hour watch is that it provides a clear and unambiguous representation of the time. It eliminates the need to distinguish between AM (ante meridiem) and PM (post meridiem) because each hour of the day has a unique number. This can be particularly useful in certain professions or situations where precise timekeeping is important, such as in the military, aviation, or astronomy.
In addition to the hour hand, a 24-hour watch typically has a minute hand and a second hand to indicate minutes and seconds, respectively. Some models may also include additional features such as date displays, chronographs, or other complications.
While 24-hour watches are less common in everyday use compared to 12-hour watches, they can be appreciated by individuals who prefer the clarity and simplicity of a 24-hour timekeeping system or those who have a specific need for it in their profession or hobbies.