The Zenith Grande Class El Primero Chronometer (Ref. 03.0520.4002) is a luxury Swiss wristwatch featuring a 44mm stainless steel case, a striking silver dial, and the iconic, high-frequency integrated El Primero Calibre 4002 automatic movement.
Movement: Zenith El Primero Calibre 4002, automatic self-winding, COSC-certified chronometer.
Frequency: 36,000 vibrations per hour (5 Hz), allowing for 1/10th of a second chronograph precision.
Power Reserve: Approximately 50 hours.
Case Dimensions: 44 mm diameter, 13.5 mm to 14 mm thickness.
Dial Aesthetic: Silver dial with applied silver Arabic numerals and arrow index markers, a pyramid/hobnail textured pattern, and a date window situated between the 4 and 5 o'clock positions.
Complications: Twin-register chronograph (30-minute counter at 3 o'clock and small running seconds at 9 o'clock), along with a quick-set date.
Crystals: Scratch-resistant sapphire crystal front and an exhibition sapphire crystal caseback.
Water Resistance: 30 meters (3 ATM) to 50 meters (5 ATM) depending on production year configurations.
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