Zenith's celebrated calibre 5011 was developed in the late 1950s by Jean-Pierre Gerber, Technical Director of Zenith, for the firms' marine chronometers and deck watches and for observatory contests. The movement went into production in 1969 and was used until 2007.
Zenith was founded in 1865 in Le Locle by the young Swiss watchmaker Georges-Emile Favre-Bulle (1843-1917) under the name of Georges Favre-Jacot & Cie. In the years to come, the company manufactured high quality deck watches and pocket chronometers and won a Gold Medal at the Swiss National Exhibition in Geneva in 1896. One year later, in 1897, Georges Favre registered a new trademark, the curved name "Zenith" over a landscape and starry sky.