ETA F06.161 – Technical Communication

General Overview

• Caliber: ETA F06.161

• Platform Size: 11½ lignes (approximately 25.60 mm diameter)

• Movement Height: 3.60 mm

• Total Height: Approximately 5.10 mm (to top of the seconds pinion)

• Jewels: 3 synthetic jewels

Time and Date Display

• Display: Hours, minutes, central sweep seconds

• Big Date Function: Semi-instantaneous large date at 3 o’clock or 6 o’clock, depending on variant

• Variants:

  • Standard model with date at 3 o’clock

  • “D6” version with date at 6 o’clock

Battery, Power, and End-of-Life Feature

• Battery Type: 371 silver-oxide (1.55 V)

• Battery Height on Movement: Approximately 3.72 mm with 371; up to 4.32 mm with 395 cell

• Battery Life: Up to 68 months with 40 mAh capacity or 94 months with 55 mAh capacity

• End-of-Life (EOL) Function: Seconds hand jumps in 4-second intervals when battery voltage falls below approximately 1.30 V

Technical Specifications

• Frequency: 32,768 Hz

• Hand Hole Sizes:

  • Hour: 1.20 mm

  • Minute: 0.70 mm

  • Seconds: 0.20 mm

• Stem Type: Tap 10 (compatible with ETA F05.111.405 or S401-2021)

Electrical Testing

• Motor Control:

  • Standard operating frequency is 8 steps per second at 1.55 V

  • Doubled to 16 steps per second at EOL voltage threshold

• Stop Mechanism: Motor stops when crown is pulled to the setting position

• Testing Conditions: Ideal temperature for testing is between 20°C and 25°C

Serviceability and Compatibility

• Lubrication: Use Moebius 9014 or 9034 for light oiling and D5 or HP-1300 for high-friction points

• Component Compatibility: Shares components with ETA F06.111 and F06.115 movements

• Replacement Option: Can replace older calibers such as ETA 955.102

• Case Use: Commonly used in mid-range Swiss watches due to its reliable performance and larger date display

Technical Specifications Summary

Watchmaker Notes

1. Battery Selection: Choose correct cell thickness to ensure proper fit in the case.

2. Date Variant: Confirm the correct date window position based on dial and case design.

3. EOL Function: Watch for 4-second jump as indication of low battery.

4. Case Clearance: Ensure the 5.10 mm total height fits under the dial and crystal.

5. Service Protocol: Use standard ETA cleaning and lubrication techniques for optimal longevity.

Conclusion

The ETA F06.161 is a durable, flexible quartz movement with an integrated large date display, efficient power consumption, and strong compatibility with other ETA calibers. Its long battery life, standardized parts, and robust design make it a preferred choice for watchmakers seeking reliability and ease of service.