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SKU 03.3300.3604/69.M3300

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.

Key Points Automatic El Primero column-wheel chronograph able to measure and display 1/10th of a second Opening revealing the legendary beating heart of the El Primero movement Silicon escape-wheel and lever Increased power reserve of 60 hours Stop-second mechanism
Name El Primero 3604
Auto/manual Automatic
Components 269
Jewels 35
Frequency 36,000 VpH (5 Hz)
Power-reserve approx. 60 hours
Functions Hours and minutes in the centre Small seconds at 9 o'clock 1/10th of a second Chronograph: - Central chronograph hand that makes one turn in 10 seconds - 60-minute counter at 6 o'clock - 60-second counter at 3 o'clock
Case, Dial & Hands
Thickness 13.60 mm
Water-resistance 10 ATM
Case-back Transparent sapphire crystal
Crystal Domed sapphire crystal with anti-reflective treatment on both sides
Hour-markers Rhodium-plated, faceted and coated with SuperLuminova SLN C1 [Hour markers]
Diamonds No
Straps & Buckles
Interhorn (case) 20
Interhorn (buckle) 16
Interchangable Strap System No
  • Bracelet Strap: Metal bracelet
  • Brands: Zenith
  • Category: Timepieces
  • Collection: CHRONOMASTER
  • Dial Color: Silver matte with two different-coloured counters & an Hesalite counter
  • Diameter: 39.5 mm
  • Metal: Stainless steel

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