Founded in Le Locle in 1865, Zenith has built its identity around a single movement milestone: the El Primero, launched in 1969 as the world's first automatic integrated high-frequency chronograph. The A384 was among the founding references, introduced in the early 1970s, distinguished by a sharp tonneau profile, an angular case, and a visual boldness that set it apart from the round-cased chronographs of the era.