The ETA 9154, also known as the Ebauches SA or ESA 9154, represents an early bridge between mechanical and electronic watchmaking. Introduced around 1970, this vintage “Dynotron” movement marked a transitional phase in horology with its electronically controlled balance motor. Produced into the mid-1970s, it powered various watches during the quartz revolution’s dawn.
Key Features
Electronic Regulation: Uses a transistor-based circuit to control the balance wheel, enabling a smooth sweep seconds hand unlike abrupt quartz stepping.
Calendar Functions: Includes quickset date, with some variants offering day-date complications via dedicated wheels and jumpers.
Hack Mechanism: Features mechanical and electrical stopping for precise time-setting, plus a sweep second pinion.
Battery-Powered: Relies on a standard cell (e.g., reference 343) with a fixing clamp, driving the motor electronically.
Technical Specs
Size and Build: Compact design with auxiliary plates, balance bridge, and interchangeable parts like those in related ETA/ESA 9157/9158 calibers.
Components: Key elements include cannon pinion (SS, ref 245/1193), minute wheel (260/1109), and regulator (2-piece, 301/1399).
Maintenance Notes: Prone to circuit issues like resistance in ESC contacts; repair involves cleaning solder residue.
Historical Context
Ebauches SA, later absorbed into ETA, produced the 9154 amid 1970s innovation. Collectors value its quirky hybrid nature—mechanical gears with electronic pulses—for vintage restorations. Spare parts remain available for wheels, screws, and modules, supporting ongoing repairs.
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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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