The ETA 2790-1 is a compact automatic mechanical watch movement renowned for its reliability and slim profile, ideal for dress watches.
Overview
Produced by ETA SA from 1976 to 1980, the ETA 2790-1 features a 11.5 ligne (25.6 mm) diameter and measures just 3.65 mm thick, making it suitable for ultra-thin cases. Approximately 1,033,700 units were manufactured, reflecting its popularity among Swiss watchmakers. It belongs to the ETA 2700 family, emphasizing precision engineering with a self-winding rotor.
Key Specifications
Mechanism: Automatic with sweep seconds and central rotor.
Beat Rate: 36,000 vibrations per hour (10 beats per second) for smooth seconds hand motion.
Jewels: 17, reducing friction for longevity.
Power Reserve: Around 42 hours.
Functions: Day-date at 3 o’clock with quick-set mechanism.
Frequency Variant Note: Related models like 2789-1 run at 21,600 bph, but 2790-1 prioritizes higher beat for finesse.
Design and Features
The movement uses a Glucydur balance wheel and Nivarox hairspring for shock resistance (Incabloc standard). Its double date capability and quick-set day/date enhance usability, as seen in assembly guides highlighting the intricate date wheels. Parts like the main plate (No. 100) and bridges remain available for repairs, supporting vintage restorations.
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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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