The term 'pocket-watch accessory' can be summarized as a FOB, which stands for 'Fob Watch'. A Fob Watch is a type of pocket watch that is attached to a chain or ribbon and worn around the neck or waist. It was popular in the 19th century and is still used today by some people as a fashion accessory. The Fob Watch is typically smaller than a regular pocket watch and is designed to be easily accessible.