ETA G10.791 – Technical Communication

The ETA G10.791 is a Swiss-made quartz chronograph movement designed for modern timepieces that require multifunctional performance, durability, and a compact build. It is part of ETA’s Fashionline series, which focuses on accessible, serviceable, and reliable movements for analog wristwatches. The G10.791 shares key architectural similarities with the well-known G10.711 but offers a few mechanical updates and refinements that improve robustness and production efficiency.

General Description

The movement has a diameter of 13¼ lignes, equivalent to approximately 29.80 mm, making it suitable for a wide range of men's and unisex watches. The movement height is approximately 5.62 mm, and the total height, including the center seconds pinion, can reach around 7.90 mm. With four synthetic jewels, the G10.791 is designed to reduce friction in the gear train and increase longevity under normal operating conditions.

Like other movements in this category, it features three central hands for hours, minutes, and chronograph seconds. Additionally, it has three subdials dedicated to 1/10-second timing, 60-second tracking, and a 30-minute totalizer, making it a full-featured chronograph.

Display and Functions

The ETA G10.791 offers standard analog time display with a central hours and minutes hand and a sweeping chronograph seconds hand. It also includes a practical and easy-to-read date display, typically positioned at 4:30. The chronograph function includes cumulative timing (ADD) and split timing (SPLIT), which allows the user to record elapsed intervals without stopping the main chronograph.

One of the defining features of this movement is the 1/10-second precision counter, which provides high-resolution time tracking for up to 30 minutes. The reset function is controlled via pushers, and if misalignment occurs, manual reset procedures can be followed by trained technicians.

Electrical Performance and Battery

The movement is powered by a standard silver-oxide 394 battery (1.55 V), providing an estimated battery life of approximately 30 to 38 months. This makes the G10.791 ideal for users seeking low-maintenance timekeeping with infrequent battery changes. The movement also includes an End-of-Life (EOL) indicator. When the battery voltage drops below a certain threshold, the seconds hand begins to jump in four-second intervals instead of moving smoothly, alerting the wearer to replace the battery soon.

Hands and Stem Compatibility

The ETA G10.791 uses industry-standard hole diameters for hand fitting: 1.50 mm for the hour hand, 0.90 mm for the minute hand, and 0.25 mm for the central chronograph seconds hand. The subdial hands typically require a 0.20 mm hole size. These dimensions ensure compatibility with a wide variety of aftermarket and OEM handsets.

The stem is a Tap 10 model, with ETA reference 401-1497. This makes it compatible with many existing crowns and case designs that support Fashionline chronograph calibers.

Service and Technical Notes

Serviceability is one of the strengths of the G10.791. The movement is modular, meaning it can be disassembled and maintained in layers by qualified watchmakers. Torque values for bridge screws and hand-setting posts follow standard ETA specifications, typically around 0.6 to 0.7 Ncm.

As with all quartz movements, care should be taken to protect the electronic components from static discharge and moisture. All assembly and testing should be performed in a clean, temperature-controlled environment. The ideal testing temperature range is between 20 and 25 degrees Celsius.

Use and Compatibility

The ETA G10.791 is found in a range of Swiss chronograph watches, particularly in the fashion and sports segments. Its reliable operation, clear layout, and long service life make it a preferred choice for brands requiring precise and cost-effective quartz chronograph solutions. Additionally, it is compatible with many watch cases originally designed for the G10.711, simplifying replacement and inventory management.

Conclusion

The ETA G10.791 is a durable, multifunction quartz chronograph movement that balances precision, energy efficiency, and serviceability. Its configuration suits both everyday and professional use, offering split timing, a 1/10-second counter, and a practical date display. With a proven platform and modern refinements, it remains a reliable engine for analog chronographs requiring Swiss-made performance.