Zenith has a long and interesting history. After the First World War Zenith began with the development and manufacture of wristwatches. Some of the first movements were the alarm and chronograph functions. Zenith was instrumental in developing the now-standard central seconds complication. Zenith is made famous by the El Primero movement which was developed in 1969 and still used today. The Zenith Defy and Elite continue to define this company.