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The CHRONOMASTER Open offers a view of the beating heart of the El Primero movement from the dial. Crafted in a sleek 39.5mm steel case, this version features a matte silver dial with tricolour counters and a transparent counter for the running seconds, paired with a blue cordura-effect rubber strap. Powered by the El Primero 3604 1/10th of a second automatic chronograph movement.

Ref 03.3300.3604/69.C823


Sizing guide

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  • All orders placed on the online boutique are expedited with free shipping and returns with a 14-day return period.

    • VI
    • MC
    • Bank transfer

Technical features

  • Diameter 39.5 MM
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Time to Reach Your Star

The Heart of Precision

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.
The El Primero 3604 1/10 th of a second automatic chronograph movement is a modified version of the 3600 that debuted in the CHRONOMASTER Sport, featuring an open base plate and bridges that allow for a clearer view of the high-frequency 5Hz escapement with lubricant-free silicon escape wheel and pallet lever. The automatic winding mechanism efficiently delivers a power reserve of 60 hours.
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