Chronomaster OpenOffering a view of the beating heart of the El Primero Presented in a sleek 39. 5mm steel case White dial with three countersMeasures and displays elapsed time with 1 10th of a second precision Driven with precision by the iconic El Primero 3604 movementREVEALING THE BEATING HEART WITHIN Bridging the past and present, the Chronomaster collection embodies the brands mastery of automatic, high frequency chronograph movement and the unique design
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