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Chronomaster El Primero Full Open

Peer into the beating heart of the El Primero automatic high-frequency chronograph calibre with the Chronomaster Open. Partially revealing the inner workings of the El Primero, the Chronomaster Open highlights the high-frequency escapement of the famed calibre, beating at 5Hz (36'000 VpH) with the escape wheel and pallet lever crafted in cutting-edge silicon, which requires no lubrication.