The Eterna Calibre 1321 stands as a pinnacle of mid-20th-century Swiss horology, captivating vintage watch enthusiasts and hobbyist watchmakers with its compact automatic design. Introduced around 1953 as part of the Eterna-Matic family, this self-winding movement replaced earlier models like the Cal. 1199, emphasizing reliability and finesse in ladies’ and smaller dress watches. Its enduring appeal lies in the ball-bearing rotor system, a hallmark of Eterna’s innovation, delivering smooth winding even during minimal wrist motion.
Historical Context
Emerged during the post-WWII automatic boom, showcasing Eterna’s push for slim, efficient calibers.
Primarily fitted in elegant women’s timepieces from the 1950s-1960s, often under brands like Eterna or rebranded for luxury houses.
Replaced by more modern variants but cherished today for restoration projects due to part availability in vintage markets.
Technical Specifications
Size: 10 ligne (22.3 mm diameter, ~3.90 mm height).
Jewels: 27 high-quality synthetic rubies.
Frequency: 18,000 vph (2.5 Hz), balanced for longevity.
Power Reserve: Approximately 40-42 hours.
Functions: Hours, minutes, central sweep seconds; self-winding via bidirectional rotor on ball bearings.
Regulation: Free-sprung balance, adjustable for positions and temperature.
Winding: Automatic only; rotor winds in both directions for efficiency.
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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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