The Zenith Chronomaster El Primero Full Open comes in two versions: with 38- or 42-millimeter case. Of course, both with El Primero movement
Movement Zenith El Primero 400 | Automatic | Diameter: 30 mm / 13¼ lignes | Thickness: 6.6 mm | Frequency: 36,000 vph (5 Hz) | Jewels: 31 | Parts: 278 | Oscillating weight adorned with Côtes de Genève motif | Hours, minutes, small seconds, date, column-wheel chronograph | Power-reserve: 50 hours
Movement Zenith El Primero 400