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mega Caliber 1140: Advanced Automatic Chronograph Movement

The Omega Caliber 1140 is an automatic mechanical chronograph movement introduced in the late 1990s. It is based on the ETA/Valjoux 7750 platform, extensively modified by Omega to meet their stringent standards for accuracy, durability, and finishing.

This caliber has powered many prominent Omega Speedmaster and Seamaster chronographs, combining robust construction with precise timing capabilities.

Technical Specifications

• Type: Automatic mechanical chronograph

• Functions: Hours, minutes, central chronograph seconds, 12-hour and 30-minute counters, date

• Jewels: 25

• Frequency: 28,800 vibrations per hour (vph)

• Power Reserve: Approximately 44 hours

• Diameter: Approximately 30 mm

• Thickness: Around 7.9 mm

Watches Featuring Caliber 1140

The Caliber 1140 has been used in:

• Omega Speedmaster Automatic chronograph models of the late 1990s and early 2000s

• Omega Seamaster chronographs from the same period

• Other high-performance Omega chronograph watches

These watches typically feature:

• Stainless steel or precious metal cases

• Tachymeter or dive bezels

• Date windows at 3 o’clock

• Sapphire or hesalite crystals depending on model

Performance and Durability

The Omega Caliber 1140 is known for:

• Reliable and smooth automatic winding

• Precise and stable chronograph timing

• Robust construction suitable for professional use

• High beat frequency ensuring accurate timekeeping

Maintenance and Servicing

Maintenance recommendations include:

• Servicing every 3 to 5 years, especially for chronograph functions

• Cleaning, lubrication, and adjustment of movement and chronograph components

• Replacement of worn parts to maintain accuracy and performance

Professional servicing is advised due to the movement’s complexity.

Collector Appeal

Collectors appreciate the Omega Caliber 1140 for:

• Its role in Omega’s chronograph legacy during the late 1990s and early 2000s

• Use in iconic Speedmaster and Seamaster models

• Mechanical excellence and precise timing functions

• Vintage appeal with modern performance

Final Thoughts

The Omega Caliber 1140 remains a benchmark for reliable and precise automatic chronograph movements. It continues to be highly regarded by collectors and watch enthusiasts worldwide.