The Eterna 1491 calibre stands as a robust manual-wind chronograph movement, prized by vintage watch enthusiasts and hobbyist watchmakers for its reliability and engineering finesse. Often a signed variant of the Valjoux 72, it powered iconic 1960s pieces like the Eterna Tri-Compax, blending Swiss precision with practical functionality.
Historical Context
Developed in the mid-20th century, the 1491 emerged during Eterna’s golden era of chronograph innovation, adapting proven Valjoux base designs for high-performance timing.
Featured in sports and dress chronographs, it appealed to pilots and racers needing durable, column-wheel-free operation under stress.
Collectors value its scarcity today, as serviceable spares remain available through specialist suppliers, aiding restorations.
Technical Specifications
Type: Manual-wind chronograph, 17 jewels.
Dimensions: 13 lignes (30mm diameter), 5.25mm height.
Frequency: 18,000 vph (2.5 Hz), with Glucydur balance and Nivarox hairspring.
Functions: Central seconds chronograph, 30-minute and 12-hour counters at 3 and 9 o’clock, small seconds at 6 o’clock.
Shock protection: Eterna-U system for impact resistance.
Power reserve: Approximately 45-50 hours fully wound.
Finishing: Signed bridges, perlage on plates, blued screws.
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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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