The Omega Seamaster Diver 300M is one of Omega's most recognizable diving watches, admired for its exceptional water resistance, robust construction, and reliable Co-Axial automatic movement. While designed for demanding environments, regular maintenance remains essential to preserve its long-term performance.
This service case highlights how a complete overhaul successfully restored a Seamaster that had developed moisture-related issues.
Customer Complaint
The customer reported that the watch had accidentally been exposed to water during a swimming trip several weeks earlier.
Soon after, the following symptoms appeared:
-
Light condensation inside the crystal
-
Daily timekeeping became inconsistent
-
Reduced power reserve
-
The seconds hand occasionally hesitated
-
Manual winding no longer felt smooth
To avoid permanent movement damage, the customer immediately brought the watch in for inspection.
Professional Diagnosis
After opening the case, our watchmaker discovered traces of moisture inside the movement.
Further inspection revealed:
-
Moisture contamination on several movement components
-
Degraded lubricants caused by water exposure
-
Minor oxidation beginning on selected steel parts
-
A worn case-back gasket that no longer sealed properly
-
Dust particles inside the automatic winding mechanism
Fortunately, the movement had not suffered severe corrosion, allowing it to be fully restored.
Complete Service Process
The repair included the following procedures:
-
Complete movement disassembly
-
Ultrasonic cleaning of all movement parts
-
Removal of moisture residue and oxidation
-
Inspection of the escapement and gear train
-
Replacement of all waterproof gaskets
-
Fresh application of Swiss-grade lubricants
-
Movement reassembly and regulation
-
Water-resistance pressure testing
-
Multi-day accuracy and power reserve testing
Each component was carefully inspected before reassembly to ensure reliable long-term operation.
Final Results
Following the complete overhaul, the watch achieved excellent performance:
-
Stable daily accuracy within professional standards
-
Full power reserve restored
-
Smooth manual and automatic winding
-
Crystal completely free of condensation
-
Water-resistance successfully passed pressure testing
The customer was pleased that the watch had been restored before moisture caused permanent damage.
Preventing Moisture Damage
Even professional diving watches require periodic inspection to maintain their water resistance.
Owners are encouraged to:
-
Replace waterproof gaskets during scheduled servicing
-
Have water resistance tested once a year
-
Avoid operating the crown or pushers underwater
-
Rinse the watch with fresh water after swimming in salt water
-
Schedule a complete movement service every 3–5 years
Regular maintenance helps protect both the movement and the long-term value of your luxury timepiece.
Professional Watch Service
Professional Watch Service specializes in luxury mechanical watch repair and maintenance with over 20 years of professional experience.
⭐ Over 20 years of watch servicing expertise
⭐ Transparent pricing with no hidden charges
⭐ Efficient turnaround times
⭐ Personalized servicing recommendations for every watch
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.
