The oldest pocket watch dates back to the 1500s. The name of the inventor was Peter Henlein and was the first timepiece in history to measure time accurately. Pocket watches seem to have been around as early as 1400.
The word “wristwatch” was first used in the 1890s. The wristwatch was popularized by the soldiers in World War I when they wanted a handy timepiece that would stay on their wrist despite the vibrations of the war.
They were more convenient than a pocket watch.