he year 1969 was a key year for Zenith for two reasons. The Le Locle-based brand, which was founded in 1865, had two significant releases that year. The first was the El Primero movement, which was the world’s first fully integrated, non-modular, automatic chronograph movement. Capable of measuring time at 1/10th of a second intervals, it was both compact and very precise, running at 36,000vph. The El Primero continues to make its mark on the watch world, as does the other product that Zenith
