Eterna Caliber 1511: A Vintage Automatic Gem
The Eterna 1511 stands as a pinnacle of mid-20th-century Swiss horology, cherished by vintage watch enthusiasts and hobbyist watchmakers for its robust engineering and smooth operation. Produced from the 1960s onward, this automatic movement exemplifies Eterna’s legacy of innovation, particularly its ball-bearing rotor system that ensures efficient winding.
Historical Context
Introduced during Eterna’s golden era of self-winding calibers, the 1511 evolved from earlier Eterna-matic designs like the 1248. It powered affordable yet reliable dress and sports watches, often found in models from the 1970s. Collectors prize it for its clean finishing, durability under daily wear, and compatibility with period cases.
Technical Specifications
Size: 11.5 lignes (25.6 mm diameter), 4.6 mm height
Jewels: 17
Functionality: Sweep central seconds, automatic bi-directional winding
Frequency: 19,800 vph (3 Hz)
Power Reserve: Approximately 40-45 hours
Balance: Glucydur with flat Nivarox hairspring
Shock Protection: Eterna-U system
Rotor: Signature Eterna 5-ball bearing mount for low-friction efficiency
Mainspring: High-performance Eterniflex design
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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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