The Eterna 1501 calibre stands as a pinnacle of 1960s Swiss engineering, powering the rare Eterna-Matic 3000 Sevenday models prized by vintage enthusiasts. Introduced around 1967, this automatic movement evolved from earlier Eterna designs, based on an ETA 2498 base but customized for exceptional seven-day power reserve and quick-set day/date complications. Hobbyist watchmakers value its robust construction and serviceability, making it ideal for restoration projects.
History and Evolution
Emerged in the late 1960s as part of Eterna’s push for long-power-reserve automatics, succeeding the 1466U (18,000 bph) and 1500K (21,000 bph) variants.
Featured in stainless steel cases around 35mm, often with Milanese bracelets, targeting dress watches with practical longevity.
Production emphasized bi-directional winding and precision adjustments, reflecting Eterna’s innovation post their 1948 ball-bearing rotor patent.
Technical Specifications
Type: Self-winding automatic lever movement with day/date and sweep seconds.
Jewels: 21, reducing friction in high-wear pivots.
Diameter: 35mm (11.5 lignes), height approximately 5.5mm.
Frequency: 21,000 beats per hour (bph) in primary 1501K version.
Power Reserve: Up to 7 days, via optimized mainspring and efficient rotor.
Functions: Central seconds, day/date at 3 o’clock with quick-set via crown.
Shock Protection: Eterna-U system for balance staff resilience.
Rotor: Bi-directional, low-friction design inspired by Eterna’s historic ball-bearing tech.
Finish: Signed plates with perlage, serial-numbered for traceability.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
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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