Based on ETA’s 902 series framework and related models, the 902.501 is likely a specialized quartz movement within the series, potentially featuring slight variations in functionality or specifications compared to base models. Here’s a reasonable projection of its characteristics:
Basic Attributes: It is presumably an analog-display quartz movement, likely powered by a Renata R321 (321/SR616SW) battery—consistent with the 902 series’ focus on long battery life. This configuration would likely deliver 100-120 months of operation under normal use, minimizing maintenance needs.
Dimension Specifications: Following the series’ compact design, it probably has a diameter around 13 x 15.15 mm and a core thickness of approximately 2.4 mm. This slim profile makes it suitable for ultra-thin watch cases, particularly in delicate or small-sized timepieces.
Height Configurations: It may offer multiple overall height options (such as HCP 0, standard, HCP 3) to accommodate different case requirements, with heights likely ranging from 3.20 mm to 3.92 mm, ensuring compatibility with diverse watch designs.
Functional Features: While retaining the 2-hand (hour and minute) core design, it might include subtle enhancements—possibly refined gear alignment or improved time-setting mechanisms—optimizing reliability without compromising the slim profile. It likely omits a second hand to prioritize minimalism.
Internal Configuration: It could feature 3-4 synthetic jewel bearings, strategically placed to reduce friction in high-wear components, ensuring stable operation and consistent timekeeping over extended periods.
Application Scope: With its balanced blend of compact size, long battery life, and potential refinements, the 902.501 is probably suited for mid-range women’s delicate watches, men’s ultra-thin minimalist styles, and casual timepieces where reliability and sleek design are prioritized. It may also serve as an upgraded replacement for older 902 series models in repair scenarios.
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