The ETA 2550 is a vintage automatic mechanical watch movement produced by ETA, a renowned Swiss manufacturer, primarily during the 1960s and early 1970s. Known for its reliability in mid-range timepieces, it features a sweep second hand and robust construction suitable for everyday wear. This caliber exemplifies ETA’s early automatic innovations, blending functionality with durability.
Key Specifications
Type: Automatic self-winding with ball-bearing rotor for smooth winding.
Functions: Hours, minutes, sweep seconds; some variants include day-date complications adjustable via crown.
Jewels: Typically 25, reducing friction in critical pivots.
Frequency: 18,000 vibrations per hour (2.5 Hz), offering a balance of accuracy and longevity.
Power Reserve: Approximately 40-45 hours when fully wound.
Historical Context
Introduced around 1955-1965, the ETA 2550 powered various dress and sports watches from brands like Omega, Tissot, and Longines until about 1972. Its shock protection system, often Incabloc, enhanced resistance to daily impacts. Production ceased as ETA shifted to higher-beat calibers like the 2824, but spares remain available for restoration.
Technical Highlights
Dimensions: 11.75 lignes (26mm diameter), height around 4.6mm, fitting standard cases.
Rotor: Bidirectional winding via peripheral ball-bearing for efficiency.
Date Mechanism: Quick-set via +/-24-hour adjustment; reliable but manual.
The movement’s simplicity aids repairs, with parts like pallet forks and balance staffs widely cataloged.
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
* If you are unable to fill out any of the required information fields, please type “N/A”.
Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
Mobile/WhatsApp: +91- 9841 360 340