Zenith El Primero Caliber 400 | Full Watch Service Overview

Welcome to our in-depth service video of the legendary Zenith El Primero Caliber 400! In this video, we take you through the meticulous process of disassembling, cleaning, lubricating, and reassembling this iconic automatic chronograph movement.

🔧 What to Expect:

Detailed breakdown of the El Primero Cal. 400 movement
Inspection of key components: balance wheel, chronograph mechanism, gear train
Ultrasonic cleaning of all parts to restore optimal performance
Precision oiling and adjustment for smooth operation
Chronograph function testing for accuracy and reliability


The Zenith El Primero is celebrated for being the first high-frequency chronograph movement, ticking at an incredible 36,000 vibrations per hour. Whether you're a watch enthusiast or a proud owner of this masterpiece, this service guide will give you a greater appreciation for the craftsmanship behind this timepiece.

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