Eterna Calibre 1239: A Vintage Automatic Gem
The Eterna Calibre 1239 stands as a pinnacle of mid-20th-century Swiss engineering, captivating vintage watch enthusiasts and hobbyist watchmakers with its robust self-winding design and timeless reliability. Produced from 1949 to 1953 as part of the 1237-1254 series, this movement powered elegant men’s watches during Eterna’s golden era of innovation. Its center-seconds layout and early adoption of shock protection made it a favorite for durable daily wearers.
Historical Context
Emerged post-WWII as Eterna shifted to larger automatic calibers for men’s watches, replacing earlier manual-wind models.
Featured evolving shock devices, from T- to UC-types within the first year, enhancing resilience against daily knocks.
Variants like 1239/1249 used a 13”’ size with rotors matching larger siblings, allowing flexible case designs.
Finished with rhodium plating, gilt lettering, and beveled edges scoring high (7-9 points) for aesthetics and durability.
Technical Specifications
Size: 13 lignes (30.6 mm diameter), height 5.9 mm.
Jewels: 17.
Frequency: 18,000 beats per hour (BPH).
Power Reserve: Approximately 42 hours.
Lift Angle: 52 degrees.
Features: Automatic winding with oscillating weight (E- or D-shaped, gilt or rhodium), center seconds, optional date quick-change.
Autowinder Efficiency: Rated 8/10; gear-train finish 8/10.
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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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