Zenith El Primero Stratos Flyback Striking 10th American and underwater explorer Jacques Cousteau

and underwater explorer Jacques Cousteau appeared in a documentary with the watch strapped to his wrist

It was created and then promoted as a watch for scientists

With more and more collectors learning of the value of these early Seiko divers

the crystal of his watch would pop off in the middle of a dive

Zenith El Primero Stratos Flyback Striking 10th American and underwater explorer Jacques CousteauThe El Primero was the culmination of a years long research and development process undertaken by Zenith to develop the worlds first automatic chronograph movement. Zenith announced the El Primero at a press conference on January 10, 1969. This was four years later than Zenith had intended the brand had begun developing the caliber in 1963, hoping to bring it out for Zeniths centennial in 1965. Nevertheless, on that winter day in 1969, Zenith proudly