The Eterna calibre 600S is a compact mid-century manual-wind movement that nicely bridges robust tool-watch reliability with the early elegance of Eterna’s wristwatch era for collectors and hobbyist watchmakers. It rewards careful servicing and offers an accessible platform for learning traditional Swiss movement architecture.
Historical context
Mid-1940s Eterna hand-wind calibre commonly found in restrained, Calatrava-style cases, aligning with the brand’s push into refined post-war wristwatches.
Represents Eterna’s pre-Eternamatic period, before the famous five-ball-bearing rotor defined the brand’s automatic identity.
Often encountered in prize, presentation, and competition watches, making surviving examples attractive to vintage enthusiasts.
Technical specifications
Type: Manual-winding Swiss wristwatch movement.
Jewels: Typically 15 jewels, focusing on essential pivot points for durability in regular use.
Beat rate: 18,000 vibrations per hour, giving a classic, slightly “relaxed” seconds hand sweep.
Power reserve: Approximately 30–33 hours when properly serviced and fully wound.
Balance: Cut or compensated balance with flat hairspring and traditional index regulation.
Diameter/format: Small, mid-century calibre suited to mid-sized steel or gold dress cases of the 1940s.
Bench characteristics
Straightforward three-hand layout with centre or small seconds depending on execution, making diagnosis intuitive for hobbyists.
Traditional gear train and keyless works design allows easy visual tracing of power flow from barrel to escapement.
No date or complications in typical 600S executions, simplifying servicing and reducing potential failure points.
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Stem, Crown, Hands & Spares might be available for this movement.
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