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 an integrated steel bracelet. Powered by the El Primero 3604 1/10th of a second automatic chronograph movement.

• CASE 39.5 mm Steel
• FUNCTIONS  1/10th of a second Chronograph: Central chronograph hand that makes one turn in 10 seconds. 60-minute counter at 6 o'clock. 60-minute counter at 3 o'clock
• MOVEMENT   El Primero 36,000 VpH (5 Hz)
• POWER RESERVE  60 H
• DIAL Silver matte with two different-coloured counters & an Hesalite counter
• WATER RESISTANCE  10 ATM
• STRAP  Metal bracelet