ETA F05.111 – Technical Communication

❖ General Overview

• Caliber: ETA F05.111

• Movement Type: Available with 2 hands (hour + minute) or 3 hands (including sweep seconds) and date function; date window at 3 o’clock for standard, or at 6 o’clock for the “-6” variant perrinwatchparts.com+15cousinsuk.com+15gleave.london+15watchbase.comgleave.london+3esslinger.com+3esslinger.com+3

• Ligne / Diameter: 10½’’’ (approx. 23.30 mm) gleave.london+8cousinsuk.com+8esslinger.com+8

• Movement Height: 2.50 mm; overall height (to sweep-second pinion) ≈4.04 mm startimesupply.com+12cousinsuk.com+12esslinger.com+12

❖ Mechanical Specs

• Jewels: 3

• Frequency: 32 768 Hz (quartz) gleave.london+6cousinsuk.com+6calibercorner.com+6

• Hand Hole Sizes: Hour 1.20 mm, Minute 0.70 mm, Second 0.20 mm gleave.london+7startimesupply.com+7flume.de+7

❖ Power & End-of-Life (EOL)

• Battery: Silver-oxide 371 (1.55 V) esslinger.com+13cousinsuk.com+13flume.de+13

• Battery Height on Movement: Approx. 2.62 mm when using 371; for 395 battery up to 3.22 mm esslinger.com+3cousinsuk.com+3perrinwatchparts.com+3

• EOL Feature: Sweep seconds hand moves in 4-second increments when voltage falls, indicating low battery esslinger.com+5startimesupply.com+5esslinger.com+5

❖ Variants

• F05.111 Standard: 3 hands + date at 3 o’clock

• F05.111-6: 3 hands + date at 6 o’clock startimesupply.com+15esslinger.com+15gleave.london+15

• F05.111-2: 2-hand (+ optional date at 3) with reduced overall height (~3.7 mm) esslinger.com+2esslinger.com+2perrinwatchparts.com+2

❖ Electrical & Testing Details

• Power Consumption (at 1.55 V): Standard operational current; EOL pulses double step frequency

• Standard Testing Conditions: Ambient temperature between 20–25 °C

❖ Serviceability & Interchangeability

• Stem Fitment: Tap 10 stem—ETA F05.111.405 / S401‑2021 with 0.90 mm thread ranfft.org+8cousinsuk.com+8startimesupply.com+8

• Parts & Lubrication: Based on F03.111/F05.111 platform; lubrication points and part numbers are detailed in official ETA technical sheet

❖ Cross-Compatibility

• Platform Upgrades: Fully interchangeable with F05.115 variants; same diameter, height, EOL, and date-hand configurations gleave.london

• Appearance in Watches: Used widely in mid-range Swiss brands like Tissot, Hamilton, Certina, TAG Heuer esslinger.com+2esslinger.com+2esslinger.com+2

Summary Table

Technical Notes for Watchmakers

1. Battery replacement: Use Renata 371. Verify EOL function after battery change.

2. Stem and hand fitting: Official stems and standard hole diameters ensure perfect fit.

3. Lubrication & servicing: Follow ETA F05.111 technical PDF and lubrication guide.

4. Variant selection: Confirm specific variant (date position and hand count) before ordering/replacement.

5. Upgrade path: F05.115 is a direct replacement for the F05.111, with same functional footprint.

Conclusion

The ETA F05.111 is a robust, versatile 10½-line quartz caliber offering multiple configurations (2-/3-hand, date at 3 or 6 o’clock), a useful EOL indicator, and broad compatibility with ETA’s modular quartz family. Its standard dimensions, stem and hand compatibility, and presence in widely recognized Swiss brands make it a go-to choice for both manufacturing and repair work.