Eterna 852S: A Timeless Workhorse for Vintage Enthusiasts
The Eterna Caliber 852S, a robust manual-wind movement from the 1930s-1950s, captivates vintage watch collectors and hobbyist watchmakers with its oversized presence and military-grade reliability. Produced by Swiss manufacturer Eterna, this 14-ligne powerhouse powered everything from civilian dress watches to Czech Air Force “Majetek” pilots’ pieces, blending simplicity with enduring performance.
Historical Context
Introduced in the pre-WWII era, the 852S gained fame in the 1940s-50s for its large diameter, demanding 36mm+ cases that created “jumbo” aesthetics by vintage standards. Eterna supplied it to military contracts, proving its toughness under stress. Hobbyists prize it for straightforward servicing—fewer complications mean easier restoration using basic tools and donor parts.
Technical Specifications
Diameter: 14 lignes (31.9mm)
Jewels: 15
Beat Rate: 18,000 vph (5 Hz)
Power Reserve: ~50 hours
Seconds: Sub-seconds at 6 o’clock
Height: ~4.5mm (thin profile)
Winding: Manual, bidirectional via knurled crown wheels
Regulation: Breguet overcoil balance spring, adjustable screws
Finish: Geneva stripes on bridges, blued screws
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
* If you are unable to fill out any of the required information fields, please type “N/A”.
Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
Mobile/WhatsApp: +91- 9841 360 340