El Primero :
Chronomaster Power Reserve

42 mm


Opening revealing the legendary beating heart of the El Primero movement Silicon escape-wheel and lever Automatic El Primero column-wheel chronograph


  • MovementEl Primero 4021, Automatic
  • Calibre13¼``` (Diameter: 30 mm)
  • Thickness7.85 mm
  • Components248
  • Jewels39
  • Frequency36,000 VpH (5 Hz)
  • Power reservemin. 50 hours
  • FinishingOscillating weight with “Côtes de Genève” motif


    - Central chronograph hand
    - 30-minute counter at 3 o'clock
    Tachymetric scale
    Hours and minutes in the centre
    Small seconds at 9 o'clock
    Power-reserve indication at 6 o'clock

Case, dial and hands

  • MaterialStainless steel
  • Diameter42 mm
  • Thickness14.05 mm
  • CrystalDomed sapphire crystal with anti-reflective treatment on both sides
  • Case-backTransparent sapphire crystal
  • Water-resistance10 ATM
  • Dials and countersBlack sunray-patterned
  • Hour-markersRhodium-plated, faceted and coated with SuperLuminova SLN C1
  • HandsRhodium-plated, faceted and coated with SuperLuminova SLN C1

Strap and clasp

  • Clasp
  • Stainless steel triple folding clasp

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