Origins and period
Le Locle, Switzerland
Founded by Georges Favre-Jacot in 1865
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Le Locle, Switzerland
Founded by Georges Favre-Jacot in 1865
Georges Favre-Jacot brought watchmaking trades together under one roof in Le Locle, helping establish the modern manufacture model. Zenith became celebrated for precision movements and, in 1969, introduced the high-frequency automatic El Primero chronograph calibre.
El Primero, Chronomaster, Defy, Pilot watches, observatory chronometry, high-frequency movements, and integrated manufacture.
Calibres, escapements, case construction, water resistance, electronic or quartz development, manufacturing methods, patents, and specialist suppliers.
Service considerations, originality, replacement parts, water-resistance assumptions, safe storage, and details that should be documented before restoration.
Official manufacturer history, museum or archive sources, technical sheets, books, catalogues, advertisements, image credits, and provenance notes.