Movement record · Switzerland
ETA 2824-2
VerifiedA compact automatic calibre with a ball-bearing-mounted rotor and reversing wheels, supplied in several finishing grades from Standard to Chronometer and used by a very large number of brands.
Technical specifications
- Diameter
- Approx. 25.6 mm (11½ lignes)
- Height
- Approx. 4.6 mm
- Jewels
- 25
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- Approx. 38 hours in standard specification
- Winding
- Automatic, bidirectional, with hand winding
- Setting
- Pull-out crown with quickset date
- Escapement
- Swiss lever
- Balance
- Glucydur-type balance with Nivarox hairspring, specification varying by grade
- Complications
- Date, Centre seconds with hacking
Identification features
- 2824-2 marking on the automatic bridge or rotor on unmodified examples
- Rotor and reversing-wheel layout familiar from countless brand-modified versions
- 25 jewels, 28,800 vph
- Reversing-wheel bidirectional winding
- Date quickset; hacking seconds
Known variants
- Standard, Elaboré, Top and Chronometer grades
- Brand-specific modified versions with altered rotors and regulation
- Sellita SW200 equivalent
Servicing notes
Very well documented with excellent parts supply, which is a substantial part of its appeal; grade differences affect regulation expectations, not basic servicing.
General guidance only. Antique movements should be serviced by a qualified watchmaker.
Historical significance
ETA's standard 11½-ligne automatic movement, with date, developed from the Eterna 1427 lineage; among the most widely used Swiss automatic calibres.
Photographs
Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.
Sources & references
- ETA technical communication for calibre 2824-2
- Power-reserve and rate figures differ slightly between grades and revisions.
Where sources disagree, the disagreement is stated rather than resolved silently.