In 1524, Peter Henlein created the first pocket watch. Before the 1900s, most watches were pocket watches which were carried in a pocket and attached to a chain.
Although there is dispute about “who did the invent it ?” : some says Peter Henlein only invented mainspring,and make watch smaller
also there is dispute about the year of invention by Peter Henlein . some source says it was at 1505 and some says 1524.