The double tourbillon version relies on a tourbillon each for the time display and chronograph function, while the El Primero Fusee with a tourbillon uses a fusee and chain mechanism to modulate the force of the mainspring. Other highlights include El Primero movements with a double tourbillon or fusee. The latter boasts an incredible frequency of 50 Hz, which allows timing to 1/100th of a second. It is fitted with two oscillation/escapement systems – one for the time display, which runs at 5 Hz, and another for the chronograph. The El Primero 21, introduced in 2017 and found in some watches in the Defy line, increases the movement's already legendary precision by a factor of ten. Today, the El Primero powers various watches in the, Defy, and Pilot series. In comparison, the Valjoux 7750 from ETA only has a power reserve of around 44 hours. Despite its frequency, the caliber has a power reserve of 50 hours when fully wound. Thanks to an unusually high balance frequency of 36,000 vph (5 Hz), the movement can measure 1/10th of a second – a feat that remains a rarity in mechanical chronographs to this day. The El Primero earned the brand with the star logo its place in horological history and has since become Zenith's showpiece. ![]() The movement was released in 1969 and is considered the first automatic chronograph movement ever produced. ![]() The Swiss luxury watch manufacturer Zenith is inseparable from their famous chronograph caliber, the El Primero, which means "the first" in Spanish.
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