One of the most celebrated automatic movements of modern watchmaking, the name “El Primero” refers to both the movement (translating to “the first” in Spanish) and the line of watches Zenith debuted featuring this movement. Launched in 1969, the El Primero caliber was simply revolutionary. It was one of the very first automatic chronograph movements ever created, and furthermore, it was designed as a wholly integrated chronograph movement rather than being an automatic movement with an added chronograph module.