The ETA 2551 is a compact automatic mechanical watch movement produced by ETA from 1965 to 1972, renowned for its use in ladies’ watches.
Key Specifications
Size: 7¾ lignes (17.5mm diameter, 17.2mm casing, 4.5mm height)
Jewels: 21
Beat Rate: 21,600 bph (3 Hz) with 51° lift angle
Power Reserve: Approximately 42 hours
Functions: Sweep seconds, central hours/minutes, date quickset (correct by advancing time past 21:20-24:00)
Technical Highlights
This self-winding caliber features a bidirectional rotor via an innovative excenter mechanism with a single gear stage, using a lever and ratchet for efficient winding. A planet differential gear on the dial side blends automatic and manual power independently. It includes Incabloc shock protection and pin-lever escapement, making it reliable for slim cases despite its tiny footprint.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
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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