A pocket watch is a timepiece carried in the pocket rather than worn on the wrist. The first pocket watches were invented in1510 by a German called Peter Henlein. A pocket watch can have a visible bezel, or it can be encased in silver or gold. The case is usually highly polished and can have a design or have engraving on it. A pocket watch is used with a silver or gold chain and its length depends where it is worn. Either the waistcoat, lapel or belt loop. The chain or ornaments on it are known as a 'fob'. They often have a hinged metal cover to protect the face of the watch; pocket watches with a fob and cover are often called 'fob watches'. Also common are fasteners that are put through a buttonhole and worn in a jacket or waistcoat, this type are frequently associated with and named after train conductors.