Omega Caliber 1155: Advanced Automatic Chronograph Movement

The Omega Caliber 1155 is an automatic mechanical chronograph movement introduced in the early 2000s. Based on the ETA/Valjoux 7750 platform, it has been extensively modified and finished by Omega to meet high standards for accuracy, durability, and aesthetic quality.

This caliber powered various Omega Speedmaster and Seamaster chronographs, combining solid mechanical engineering with precise timekeeping.

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 1155

The Caliber 1155 was used in:

• Omega Speedmaster Automatic chronographs of the early 2000s

• Omega Seamaster chronographs during the same period

• Other Omega chronograph models requiring robust and precise movements

Typical watch features include:

• Stainless steel or precious metal cases

• Tachymeter or dive bezels

• Date windows usually positioned at 3 o’clock

• Sapphire crystals with anti-reflective coatings

Performance and Durability

The 1155 movement offers:

• Smooth and reliable automatic winding

• Accurate and stable chronograph functions

• Robust construction suitable for professional and everyday use

• High beat rate ensuring precise timekeeping

Maintenance and Servicing

Recommended maintenance includes:

• Regular servicing every 3 to 5 years

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

• Replacement of worn parts to maintain optimal performance

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

Collector Appeal

Collectors appreciate the Omega Caliber 1155 for:

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

• Use in popular Speedmaster and Seamaster models

• Mechanical reliability and precise timing

• A blend of modern engineering and vintage style

Final Thoughts

The Omega Caliber 1155 remains a highly regarded automatic chronograph movement, showcasing Omega’s dedication to quality and precision. It continues to be favored by collectors and watch enthusiasts worldwide.