Zenith SA, 30, Rue des Billodes, Les Petits-Monts, Le Locle, Région Montagnes, Neuchâtel, 2400, Schweiz/Suisse/Svizzera/Svizra
Zenith
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins76% CONFIDENCEOverall confidence: 76%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better57.8 years ago
Wikipedia's[1][3][4] Zenith page: "El Primero calibre, when it was first unveiled on 10 January 1969, was the first high frequency automatic chronograph movement"; Analog:Shift says "Zenith announced the El Primero on January 10, 1969".Zenith announced the El Primero on 10 January 1969, a high-frequency 36,000 vph automatic chronograph movement that beat the Chrono-matic group by almost two months and later powered the Rolex Daytona.