The ETA 2520 is a reliable automatic mechanical watch movement from the Swiss manufacturer ETA, part of the 2500 family introduced in the 1950s. Known for its vintage appeal and robustness, it powers classic timepieces with smooth time-only functionality. This article explores its key features and legacy in approximately 300 words.
Technical Specifications
Size and Beat Rate: Measures 11.5 lignes (25.6mm diameter), beating at 18,000 vibrations per hour (vph) for a deliberate sweep seconds hand.
Power Reserve: Approximately 40-42 hours when fully wound, suitable for daily wear without constant resetting.
Jewels: Typically 17 jewels, reducing friction in critical pivots for longevity.
Shock Protection: Equipped with KIF shock protection system, enhancing durability against impacts.
Design and Functionality
The ETA 2520 features a self-winding rotor with bidirectional winding, derived from earlier ETA designs like the 2000 series. It omits date complications, focusing on clean timekeeping with central hours, minutes, and sweep seconds. Produced primarily in the 1960s-1970s, it often appears rhodium-plated in luxury variants, such as Omega’s adapted Caliber 2520. Its 13.8mm height fits slim dress watches comfortably.
Historical Significance
As part of ETA’s workhorse 25XX lineup, the 2520 exemplifies quartz crisis-era engineering, prioritizing affordability and serviceability. Brands like Corum and others used it in vintage models, making parts still available today via specialists. Collectors value its “new old stock” examples for restoration projects.
Modern Relevance
Though discontinued, the ETA 2520 remains popular among horology enthusiasts for repairs and custom builds. Its lower beat rate offers a traditional feel compared to modern 28,800 vph movements, ideal for vintage-inspired watches. Spare parts scarcity underscores the need for skilled watchmakers.
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Stem, Crown, Hands & Spares might be available for this movement.
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