The ETA 9181 stands as a pioneering quartz movement from ETA, marking a key milestone in Swiss horology’s shift to electronic timekeeping. Introduced around 1973-1975 as one of the first mass-produced three-hand quartz calibers by Ebauches SA (later ETA), it powered analog displays with remarkable accuracy for its era.
Key Specifications
Size and Build: 29 mm diameter (ligne 11.5), 5.75 mm thick, with high machine fabrication for cost efficiency.
Functions: Hours, minutes, seconds, often with day-date complications in variants like the 9181.
Power: Battery-driven (SR621SW or 364 cell), quartz-controlled stepper motor with 32,768 Hz crystal for precision.
Innovations: Features a unique four-coil stator for near-silent stepping, integrated electronics on a plastic plate, and hacking via crown contact closure.
Technical Highlights
This movement integrated a custom IC (E7047), variable capacitor, and attached stepper motor, emphasizing modularity over repairability—electronics were replaced as units. Produced mainly in the late 1970s to 1980s, it exemplified the Quartz Crisis transition, offering reliability in mid-range watches. Spare parts like cannon pinions, wheels, and coils remain available via specialists, though aging electronics pose service challenges.
Historical Context
Developed amid quartz innovation, the 9181 predated widespread adoption but influenced ETA’s lineup, including sweep-second siblings like the 9180/9182. Collectors value it for vintage appeal in brands using early ETA quartz. Accuracy rivals modern standards, often within seconds per month.
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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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