"he forgot to wind it up"
Pocket watch
GNU Free Documentation LicensePocket watch - Credit: Roger McLassus

Wristwatches were only commonly worn from the 20th century. Before then, pocket watches were used. They were manufactured in Europe from the 16th century, and were designed to be carried in a pocket. They often had a protective hinged metal cover and a chain to attach them to a belt, waistcoat or lapel. They would of course stop working if not regularly wound up.