El Primero :
Stratos Flyback

45.5 mm

51.2061.405/75.M2060

Zenith military chronograph legacy Automatic column-wheel chronograph with flyback function

Movement

  • MovementEl Primero 405 B, Automatic
  • Caliber13¼```
    (Diameter: 30 mm)
  • Thickness6.60 mm
  • Components331
  • Jewels31
  • Frequency36,000 VpH (5 Hz)
  • Power reservemin. 50 hours
  • FinishingOscillating weight with “Côtes de Genève” pattern

Functions

    Hours and minutes in the centre

    Small seconds hand at 9 o'clock

    Telemetric scale

    Date indication at 6 o'clock
    3-counter chronograph with flyback function:

    Central chronograph hand

    30-minute counter at 3 o'clock

    12-hour counter at 6 o'clock

Case, dial and hands

  • MaterialSteel case with rose gold crown and push-pieces
    Unidirectional rotating bezel with rose gold disk
  • Diameter45.5 mm
  • Thickness14.10 mm
  • CrystalDomed sapphire glass with anti-reflection treatment on both sides
  • Case-backTransparent sapphire glass
  • Water-resistance10 ATM
  • Dials and countersBrown
  • Hour-markersFaceted, gold-plated and coated with SuperLuminova SLN C1
  • HandsFaceted, gold-plated and coated with SuperLuminova SLN C1

Strap and clasp

  • Strap
  • Steel and rose gold 2-tone bracelet
    Rubber strap
  • Clasp
  • Steel triple folding clasp

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