A pocket watch is a classic timepiece that has been in use since the 16th century. It is a small watch that can be carried in a pocket or attached to a chain and worn around the neck. There are several synonyms for pocket watch that refer to the design, style, or physical features. These include the term fob watch, which is often used to describe a pocket watch that is attached to a vest or jacket, pendant watch, which refers to a timepiece that is worn around the neck, and hunter-case watch, which is a pocket watch that has a cover that closes over the face of the watch. Other synonyms include open-face watch, key-wind watch, and antique watch.