The Eterna 845 calibre represents a pinnacle of pre-World War II Swiss horology, captivating vintage watch enthusiasts and hobbyist watchmakers with its elegant manual-wind design and robust construction.
Historical Context
Introduced around 1940, the Eterna 845 emerged during a transformative era for Eterna, bridging manual precision with early automatic innovations like the related 905 variant. Produced in the early 1940s, it powered military and civilian timepieces, prized today for its bevelled base plate and reliable performance amid wartime material constraints. Collectors value its scarcity, as surviving examples often feature intricate finishing visible through exhibition casebacks.
Technical Specifications
Size: 9.75 lignes (22.2 mm diameter)
Height: Approximately 3.5 mm
Jewels: 15-17, including cap jewels for key pivots
Frequency: 18,000 vph (5 Hz), with Glucydur balance and Nivarox hairspring
Functions: Hours, minutes, sub-seconds at 9 o’clock; sweep seconds option in some variants
Winding: Manual via signed crown; bi-directional capable in related bumpers
Shock Protection: Early Eterna-U system for resilience
Power Reserve: 40-45 hours fully wound
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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