El Primero Open

CHRONOMASTER El Primero Open

Peer into the beating heart of the El Primero high-frequency automatic chronograph calibre with the CHRONOMASTER Open. The CHRONOMASTER Open partially reveals the inner workings of the El Primero, and highlights the high-frequency escapement of the famed calibre, which beats at 5 Hz (36 000 vibrations per hour) with the pallet lever and escape wheel made from the latest generation of silicon, which requires no lubrication.... See more

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