Zenith introduces the Chronomaster Revival A385 January 2021 The Swiss brand is bringing back one of the earliest and most emblematic El Primero-equipped chronographs from the earliest days of the revolutionary calibre. Zenith introduces the Chronomaster Revival A385 January 2021 The Swiss brand is bringing back one of the earliest and most emblematic El Primero-equipped chronographs from the earliest days of the revolutionary calibre. 1 969 was certainly a year to remember for Zenith and would go down in the annals of watchmaking history as the year that forever changed the chronograph. It was the year that the Zenith El Primero, the world’s first automatic high-frequency chronograph, was unveiled to the world. It made its debut in three distinct stainless steel models. Among them was the A385, a tonneau-shaped steel chronograph with an eye-catching brown gradient dial, which was the first âsmokedâ dial ever to be made in the watch industry and for Zenith.