Eterna Caliber 1531: A Vintage Marvel for Enthusiasts
The Eterna Caliber 1531 stands as a testament to mid-20th-century Swiss horological ingenuity, cherished by vintage watch collectors and hobbyist watchmakers for its robust construction and timeless reliability. Produced primarily in the 1950s and 1960s, this manual-wind movement powered elegant dress watches and chronometers, embodying Eterna’s reputation for precision engineering.
Historical Context
Emerged during Eterna’s golden era of in-house calibers, post-World War II, when the brand focused on slim, high-beat movements for export markets.
Often found in Eterna’s KonTiki and other adventure-oriented models, showcasing durability in extreme conditions.
Discontinued by the 1970s, making serviced examples highly sought after today for restoration projects.
Technical Specifications
Type: Manual wind, three-hand (hours, minutes, seconds).
Diameter: 11.75 lignes (26.60 mm).
Height: 3.95 mm, ideal for slim cases.
Jewels: 17, strategically placed for reduced friction.
Frequency: 19,800 vph (2.5 Hz), balancing smoothness and longevity.
Power reserve: Approximately 42-46 hours.
Balance: Glucydur with flat hairspring; Incabloc shock protection.
Adjustments: Typically 3 positions for chronometer-grade accuracy (±10-20 sec/day).
Finishing: Geneva stripes on bridges, blued screws, and signed rotor elements.
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Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
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