The Eterna Calibre 1412 stands as a pinnacle of mid-20th-century Swiss horology, captivating vintage watch enthusiasts and hobbyist watchmakers with its innovative automatic winding system. Introduced in the 1950s as part of the Eterna-Matic lineup, this calibre exemplifies Eterna’s pioneering use of ball-bearing rotors, delivering smooth, efficient power without the noise or wear of earlier designs.
Historical Context
Debuted around 1954-1955, evolving from Eterna’s 1948 rotor automatics like the Cal. 1198.
Featured in iconic models such as the Eterna-Matic Kon-Tiki, prized for rugged reliability in vintage collections.
Represented a shift to bi-directional winding via a five-ball-bearing rotor, a hallmark Eterna invention reducing friction dramatically.
Technical Specifications
Size: 11.75 lignes (26.6 mm diameter), approximately 5.9 mm thick.
Jewels: 17 or 19 jewels, with friction jeweling for key pivots.
Functions: Centre seconds, date window (non-quickset, advances gradually ~9:30 PM to 12:05 AM).
Balance: Glucydur screwed balance, Nivarox flat hairspring, Eterna-U shock protection.
Frequency: 18,000 vibrations per hour (vph), ensuring stable accuracy of ±5 seconds/day in optimal condition.
Winding: Bi-directional automatic rotor on 5 x 0.65 mm ball bearings, Eterniflex mainspring; manual winding smooth via unsigned crown.
Finish: Clean plates with perlage, minimal markings; calibre stamped subtly under balance (e.g., 1412U or 1412UD variants).
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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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