1930: Real Automatic

In 1923, British watchmaker John Harwood took out a patent for his invention of the self-winding mechanism for the wristwatch.

Using a semicircular weight that rotated 300 degrees and ran into a spring bumper which the wearer could feel, it was known as the "bumper" design. The watch would run for only 12 hours when fully wound and the time was set using the bezel since it didn't have a traditional stem winder. With financial backing he went on to produce many thousands of watches based around his new mechanism but unfortunately due to the British economic depression of the 1920's and 30's, went bust and the Harwood company folded in 1931 allowing other companies to use the design.

Info: Ablogtowatch