Eterna Caliber 1246: A Vintage Automatic Gem
The Eterna 1246, part of the pioneering Eterna-matic series from the late 1940s to early 1950s, represents a milestone in affordable automatic watchmaking. Launched around 1949 by Swiss manufacturer Eterna, this rotor-driven movement introduced the innovative five-ball-bearing rotor system, ensuring smooth bi-directional winding with minimal friction. Vintage enthusiasts and hobbyist watchmakers prize it for its clean design, reliability, and elegant finishing, often found in period dress watches.
Historical Context
Debuted in 1949 as a men’s automatic caliber, evolving from Eterna’s hammer-wind predecessors like the 834.
Produced during 1949-1953 in Switzerland, bridging post-war innovation and the rotor automatic era.
Featured in various case sizes, with 1246 specifically a 13.5 ligne variant; related models include 1243, 1247, and 1254.
Known for “E” or “D” shaped rotors in gilt or rhodium, rhodium-plated plates with beveled edges and perlage.
Technical Specifications
Size: 13.5 lignes (30.6 mm diameter), 5.9 mm height.
Jewels: 17 (some variants up to 21).
Frequency: 18,000 beats per hour (vph).
Power Reserve: Approximately 42 hours.
Lift Angle: 52 degrees.
Balance: Glucydur, screwed, with flat Nivarox hairspring and Eterna-U shock protection.
Winding: Bi-directional rotor on 5 x 0.65 mm ball bearings; Eterniflex mainspring.
Functions: Center seconds, date (gradual change, no quick-set).
Finishing: High-quality with 7-9 points on plates, gears, and screws per enthusiast scoring.
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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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