The ETA F05.115 is a compact and functional quartz movement belonging to ETA’s F05 series, designed for entry-to-mid-range wristwatches that balance daily practicality, slim design, and basic additional functions. Below is its core information synthesized from series technical norms and industry application data:
- Movement Type: Analog-display quartz movement (reliable quartz oscillation for timekeeping, low maintenance).
- Power Source: Typically powered by a Renata 371 (SR920SW) button cell battery (a common compact battery model for small movements). Under normal daily use (e.g., no frequent exposure to extreme temperatures), the battery life can reach 36–48 months, reducing the need for frequent battery replacement.
- Dimensions: Follows the F05 series’ “slim compact” design:
- Diameter: Approximately 15.1 mm (fits small to medium watch cases).
- Core Thickness: About 2.4 mm (compatible with ultra-thin watch cases, ensuring the overall timepiece remains lightweight and sleek).
Focuses on “basic timekeeping + practical additional functions” to meet daily needs without redundant complexity:
- Time Display: Standard 3-hand layout (hour, minute, and central second hand) for clear, intuitive time reading.
- Date Display: Equipped with a date display function (a key upgrade from simpler 2-hand F-series models). The date window is typically aligned with the 3 o’clock position on the dial (the most mainstream and user-friendly calendar layout, avoiding interference with other dial elements).
- Special Functions: May include an End-of-Life (E.O.L.) Indicator (a common feature in mid-range ETA quartz movements). When the battery is nearly depleted, the second hand will jump every 4 seconds (instead of moving continuously) to alert the user to replace the battery, preventing sudden timekeeping failure.
- Jewel Bearings: Fitted with 5 synthetic ruby bearings (strategically placed at high-friction points such as gear axles). Ruby’s high hardness reduces wear between moving parts, enhancing the movement’s long-term operational stability and extending its service life.
- Timekeeping Precision: Meets ETA’s standard quartz movement accuracy: Daily error is within ±15 seconds (sufficient for daily use, far exceeding the precision of basic mechanical movements).
Due to its balanced combination of compact size, long battery life, and practical date function, the F05.115 is widely used in:
- Women’s delicate watches (e.g., small round/oval styles, where its slim thickness matches the timepiece’s elegant design).
- Men’s ultra-thin casual watches (suitable for daily wear or light business occasions, as it keeps the watch from feeling bulky).
- Entry-to-mid-range fashion watches (brands often adopt it to balance functionality, cost-effectiveness, and aesthetic slimness for mass-market models).
Note: For exact parameters (e.g., specific battery compatibility, minor structural adjustments for regional markets), refer to ETA’s official technical manuals or authorized supplier documentation.
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