Pioneering movements deserve to stand out in inspired and unprecedented designs to truly highlight their ingenuity. The new CHRONOMASTER Open exposes the beating heart of its El Primero 1/10th of a second chronograph calibre in a novel and unexpected way, while retaining the signature tricolour counters dial configuration. It reveals the high-frequency beating heart of the watch, with the escape wheel and pallet lever crafted in lubricant-free silicon.