It features an integrated chronograph with a column-wheel and horizontal clutch and the famous high beat rate of 5Hz (36,000 vph). El Primero, which means first in Spanish, is the only of the three movements still in production. The Zenith prototype was announced first but the Seiko 6139 and the Caliber 11 actually came to market first.
It’s worth noting that Seiko came out with their first automatic chronograph movement that same year (caliber 6139), and a consortium made up of Breitling, Dubois-Depraz, Hamilton-Buren, and Heuer also came out with an automatic chronograph movement in 1969 (caliber 11). In celebration of the 50th anniversary of the legendary El Primero (caliber 3019 PHC) chronograph, which in 1969 became one of the first automatic chronograph movements, Zenith has remade the original.
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