The Valjoux 7750–7765 series refers to a family of Swiss mechanical chronograph movements developed by Valjoux, a manufacturer later integrated into ETA SA, part of the Swatch Group. These calibers are among the most influential and widely used chronograph movements in modern watchmaking, known for their robustness, serviceability, and functional versatility. The series includes both automatic and manual-winding versions, making it a cornerstone in the evolution of mechanical chronographs.

Valjoux 7750: The Foundation

The Valjoux 7750, introduced in 1974, was designed to be an automatic chronograph movement using a cam-lever chronograph mechanism instead of the more traditional column wheel. This made the movement more affordable and easier to mass-produce, without compromising reliability.

Key Specifications:

• Type: Automatic chronograph

• Chronograph: Central seconds, 30-minute and 12-hour counters

• Calendar: Date or day-date

• Jewels: 25–27

• Frequency: 28,800 vibrations per hour (4 Hz)

• Power Reserve: Approximately 42–48 hours

• Diameter: 30 mm

• Height: 7.9 mm

• Chronograph Mechanism: Cam and lever

• Winding: Uni-directional automatic

It quickly became an industry standard and is still produced today under the name ETA 7750.

Manual-Wind Variants: 7760 and 7765

To meet different design and market needs, Valjoux created manual-winding versions of the 7750 platform.

Valjoux 7760:

• Manual-wind version of the 7750

• Keeps the chronograph functionality: 30-minute and 12-hour totalizers, small seconds

• No automatic rotor, resulting in a thinner profile

• Ideal for watches requiring a traditional hand-wound feel

Valjoux 7765:

• Manual-wind like the 7760

• Adds day-date display

• Slightly taller than the 7760 due to the extra calendar components

• Based on the same architecture, ensuring parts compatibility

Both of these manual versions are less common than the automatic 7750 and are considered more collectible, especially among enthusiasts of vintage or manually wound chronographs.

Additional Variants in the Family

From the 7750 base, ETA developed numerous functional and layout variations:

• 7751: Adds full calendar (day, date, month) and moonphase

• 7753: Features a different subdial layout, with the 30-minute counter at 3 o’clock

• 7754: Adds GMT function

• 7761, 7768, and others: Additional refinements or layout modifications

Many of these movements were used by well-known brands including Tag Heuer, IWC, Breitling, Sinn, Fortis, and others.

Reliability and Performance

• The cam-actuated chronograph system is simpler than a column wheel, allowing for easier maintenance

• Parts are widely available, and most competent watchmakers are familiar with this movement family

• The movement is robust and known for long-term durability, even in rugged conditions

• Often used in pilot, diving, and sports chronographs due to its reliable performance

Servicing Considerations

• Recommended service interval: every 5 to 7 years

• Chronograph module adds complexity, so proper experience is required for disassembly and reassembly

• Day-date models (like the 7765 and 7751) require extra caution when setting to avoid damaging the calendar

• Some early versions (pre-ETA standardization) may have slight component differences

Collectibility and Market Position

• The Valjoux 7750 is still in production and common in entry- to mid-level mechanical chronographs

• Manual-wind versions like the 7760 and 7765 are no longer produced, increasing their vintage appeal

• Watches housing these movements are generally considered reliable, easy to service, and highly functional

• Early versions and unique variants are sought after by collectors, particularly those preferring manual chronographs

Conclusion

The Valjoux 7750–7765 family is one of the most important mechanical chronograph platforms in modern watch history. Its combination of functional versatility, structural reliability, and long-term serviceability has made it a favorite among brands and watchmakers alike. Whether in automatic or manual form, these movements continue to define the mechanical chronograph category and offer enduring value to enthusiasts, collectors, and professional users.