Omega Caliber 1151A: Refined Automatic Chronograph Movement of the Early 2000s

The Omega Caliber 1151A is an automatic mechanical chronograph movement introduced in the early 2000s. It is based on the ETA/Valjoux 7750 platform, extensively modified and finished by Omega to meet their high standards for accuracy, robustness, and aesthetic appeal.

This caliber powers several Omega chronograph models, blending reliable performance with sophisticated timekeeping functions.

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: About 30 mm

• Thickness: Around 7.9 mm

Watches Featuring Caliber 1151A

The Caliber 1151A has been installed in:

• Omega Speedmaster Automatic chronographs of the early to mid-2000s

• Omega Seamaster chronograph models during the same period

• Other high-performance Omega chronographs

Typical features of these watches include:

• Stainless steel or precious metal cases

• Tachymeter or dive bezels

• Date windows at 3 o’clock

• Sapphire crystals with anti-reflective coatings

Performance and Durability

The 1151A offers:

• Smooth and reliable automatic winding

• Precise and stable chronograph timing

• Robust construction suitable for professional and daily wear

• High beat rate ensuring accurate and consistent timekeeping

Maintenance and Servicing

Recommended maintenance involves:

• Servicing every 3 to 5 years

• Thorough cleaning and lubrication of movement and chronograph components

• Replacement of worn parts as necessary to maintain performance

Due to the complexity of chronograph movements, professional servicing is advised.

Collector Appeal

Collectors appreciate the Omega Caliber 1151A for:

• Its role in Omega’s chronograph evolution in the early 2000s

• Use in well-regarded Speedmaster and Seamaster models

• Mechanical reliability and precision timing

• Combination of modern craftsmanship with vintage appeal

Final Thoughts

The Omega Caliber 1151A exemplifies Omega’s commitment to quality and precision in automatic chronograph movements. It remains a highly regarded caliber among collectors and watch enthusiasts.