1970s Zenith “El Primero” Cal.3019PHC Automatic Chronograph Brown GrADation Dial

1970's Manufacture Zenith Masterpiece "El Primero" with Cal. 3019PHC SS 37mm Automatic Chronograph with Brown Gradient Dial The world's first high beat automatic movement Cal. 3019PHC with 36,000 vibrations per hour, introduced in 1969, is the world's first automatic movement with 36,000 vibrations per hour. It is equipped with the world's first high-beat automatic movement Cal. With its cushion-shaped screw-back water-resistant case and colorful brown gradation dial, it is a gem that combines original design and functionality unique to this era. The watch is also highly practical, with a single crown pull to adjust the time and a two-step pull to adjust the calendar, a rarity for this age.