The Zenith Chronomaster Original is a modern interpretation of one of the most influential chronographs in watchmaking history. Powered by the legendary El Primero high-frequency automatic chronograph movement, it is capable of measuring time with exceptional precision while delivering outstanding reliability.
This service case demonstrates how a complete overhaul restored the performance of a Chronomaster after several years of regular use.
Customer's Complaint
The owner had worn the watch almost daily for more than six years.
Although the watch was still running, several issues had gradually developed:
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The chronograph pushers required more pressure than before.
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Timekeeping became inconsistent.
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The power reserve was noticeably shorter.
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The central chronograph seconds hand did not always reset perfectly.
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Manual winding felt slightly rough.
To avoid further wear, the customer requested a complete maintenance service.
Professional Inspection
After conducting timing analysis and functional testing, the watchmaker carefully disassembled the movement.
The inspection revealed:
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Aged lubricants throughout the chronograph mechanism
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Minor contamination inside the automatic winding system
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Increased friction on several chronograph components
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Hardened case-back and crown gaskets
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Slight wear on selected transmission wheels
Fortunately, no major components required replacement.
Complete Service Procedure
The overhaul included the following procedures:
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Complete movement disassembly
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Ultrasonic cleaning of every component
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Inspection of the El Primero chronograph mechanism
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Cleaning of the automatic winding system
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Replacement of waterproof gaskets
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Application of premium Swiss lubricants
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Precision reassembly of the movement
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Chronograph calibration
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Timing regulation
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Water-resistance pressure testing
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Multi-day performance observation
Each stage was completed according to professional Swiss watch servicing standards.
Final Results
Following the complete overhaul, the Chronomaster delivered excellent performance.
Results included:
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Stable daily accuracy
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Smooth chronograph operation
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Precise chronograph reset
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Restored power reserve
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Smooth manual winding
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Successful water-resistance testing
The customer reported that the watch felt significantly smoother and more responsive during daily wear.
Why High-Frequency Movements Require Regular Maintenance
The El Primero operates at 36,000 vibrations per hour (5 Hz), allowing it to measure time with exceptional precision.
Because of its high operating frequency and sophisticated chronograph mechanism, routine servicing is especially important to maintain:
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Long-term accuracy
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Smooth chronograph performance
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Efficient lubrication
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Reduced component wear
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Maximum movement longevity
A complete overhaul every 3 to 5 years helps preserve the remarkable performance of this iconic movement.
Professional Watch Service
Professional Watch Service specializes in luxury watch repair and maintenance with more than 20 years of professional experience.
⭐ Over 20 years of professional watch servicing
⭐ Transparent pricing with no hidden charges
⭐ Fast turnaround time
⭐ Personalized maintenance recommendations
Contact Us:
https://ptwatchservice.com/pages/contact
The content and images in this article are provided for watch culture and informational purposes only. The service case has been anonymized. Images are sourced from publicly available resources and official brand websites. All rights belong to their respective owners.
