The ETA 2491 is a vintage manual-wind watch movement from the Swiss manufacturer ETA, renowned for its reliability in mid-20th-century timepieces. Produced around 1965, it belongs to the compact 8.75 ligne family, offering precise timekeeping with a date complication.
Key Specifications
Size: 8.75 lignes (diameter 19.7 mm or 19.40 mm, height 3.5 mm) – ideal for smaller dress watches.
Jewels: 17, reducing friction for smooth operation and longevity.
Frequency: 18,000 vibrations per hour (vph), balancing accuracy and power reserve.
Lift Angle: 52 degrees, optimizing efficiency in manual winding.
Features: Sweep seconds hand and date window, manual wind only (no automatic rotor).
Historical Context
Introduced in the 1960s, the ETA 2491 powered various Swiss brands during the shift from post-war mechanical dominance to emerging quartz threats. Part of the 2490 family (2490 without date), it emphasized affordability and serviceability for watchmakers. Its robust construction made it a staple in vintage repairs today.
Modern Relevance
Enthusiasts value the 2491 for restorations, with spare parts available from specialists like watch-spares.com. Though superseded by ETA’s 28xx series, its simplicity appeals to collectors avoiding overbuilt modern calibers. Accuracy holds within +20/-10 seconds daily when serviced.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
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