Zenith “El Primero”

Swiss Watch Fair 1971 BF 219
The world’s only high-frequency automatic chronograph (36,000 v.p.h.), incorporating such an extensive range of advantages : - day, date and month calendar - phases of the moon - second, minute and hour registers The seconds hand runs non-stop, allowing for rigorous precision checks. Gives the 1/10th second. (ZENITH “El Primero”)