Zenith, EL PRIMERO series, model: 03.2080.400 / 01.C494, automatic mechanical, stainless steel, dial diameter: 42mm, the legendary El Primero high-frequency movement, equipped with the El Primero 400B automatic chronograph movement, has a frequency of up to 36,000 vibrations per hour, a timing accuracy of up to 1 / 10 second, and a power reserve of approximately 50 hours. It is the first mass-produced high-frequency automatic chronograph movement in history and also the "signature treasure" of Zenith.