The Valjoux 7733, 7734, and 7736 are part of the Valjoux 7730-series, a family of manual-winding chronograph movements developed during the 1960s and 1970s. These calibers were widely used in Swiss watches prior to the quartz crisis and are considered robust, affordable, and historically significant mechanical chronograph movements. They were found in timepieces from brands like Heuer, Breitling, Hamilton, Tissot, Enicar, Wakmann, and many others.

Valjoux 7733

The Valjoux 7733 is the base caliber in this family. It was designed as a simpler, cam-operated alternative to column-wheel chronographs. It offered reliable chronograph functionality at a more accessible price point.

Key Features:

• Type: Manual-winding chronograph

• Chronograph Layout:

  • Central chronograph seconds

  • 30-minute counter at 3 o’clock

  • Running seconds at 9 o’clock

• Jewels: 17

• Frequency: 18,000 vibrations per hour (2.5 Hz)

• Power Reserve: Approx. 45 hours

• Diameter: 31 mm

• Height: ~6.9 mm

• Chronograph Mechanism: Cam and lever

The 7733 became a reliable workhorse for mid-range chronographs during its production run.

Valjoux 7734

The 7734 is almost identical to the 7733 but includes a date complication.

Additional Feature:

• Date window usually located at 6 o’clock or sometimes at 3 o’clock, depending on dial design

The 7734 was more popular for watches aimed at consumers who wanted both chronograph functionality and a practical calendar display.

Valjoux 7736

The 7736 is an upgraded version of the 7733 with a 12-hour chronograph counter, adding a third sub-dial for extended timekeeping.

Chronograph Layout:

• Central chronograph seconds

• 30-minute counter at 3 o’clock

• 12-hour counter at 6 o’clock

• Running seconds at 9 o’clock

Other Specs:

• Jewels: 17

• Frequency: 18,000 vph

• Power Reserve: Approx. 45 hours

• Thickness: Slightly higher due to the added 12-hour module

This movement made the 7736 suitable for professional use, such as aviation and motorsport timing.

Technical Background

The 773x family is derived from the Venus 188, which Valjoux acquired in the 1960s. The architecture was modified for cam-based operation, simplifying construction and reducing manufacturing costs. Unlike column-wheel chronographs, these movements are easier and more affordable to service.

Servicing Considerations

• These are manual-wind movements and require daily winding

• Regular service every 4 to 6 years is recommended

• Chronograph mechanisms are mechanical and should be operated only when fully wound

• Setting the date (on the 7734) near midnight should be avoided to prevent damage

Collectibility and Legacy

• The 773x family is highly regarded for its reliability and historic role in making mechanical chronographs more affordable

• Vintage watches containing these calibers remain popular among collectors

• Parts availability is relatively good, and most qualified watchmakers are familiar with the platform

• Commonly found in tool watches, racing chronographs, and military-style timepieces

Conclusion

The Valjoux 7733, 7734, and 7736 are celebrated manual-wind chronograph calibers that brought precision timekeeping to a wider audience during the golden age of mechanical watches. Each variation—simple (7733), practical (7734), or extended (7736)—offers a glimpse into an era where mechanical craftsmanship met function-driven design. These calibers remain valued by vintage watch enthusiasts for their robust performance, ease of service, and timeless appeal.