Eterna Caliber 970: A Vintage Gem for Enthusiasts
The Eterna Caliber 970 stands as a pinnacle of mid-20th-century Swiss engineering, blending reliability with innovative complications for vintage watch lovers and hobbyist watchmakers. Crafted by Jaeger-LeCoultre and used in select Eterna models, this automatic movement powered elegant timepieces like the Reverso Grande Automatic, offering a large date and GMT functionality.
Historical Context
Introduced around the early 2000s, the Caliber 970 reflects Eterna’s legacy of rotor innovations tracing back to their 1948 Eterna-matic with ball-bearing rotors. It embodies toughness and precision, appealing to collectors restoring golden-era automatics. Hobbyists prize its hand-decorated bridges and serviceable design, evoking the brand’s ball-bearing heritage from the 1950s Cal. 1248.
Technical Specifications
Type: Mechanical automatic with unidirectional rewind rotor on ceramic bearings.
Jewels: 29 rubies.
Height: 5.70 mm.
Diameter: Approximately 28 mm (based on similar JLC calibers).
Frequency: 28,800 vibrations per hour (4 Hz).
Power Reserve: 50 hours, optimized via enlarged spring drum.
Balance: Variable inertia balance wheel for enhanced precision.
Functions: Hours, minutes, seconds, large date, second time zone (GMT).
Adjustments: All via single crown; no quick-set date.
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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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