Omega 1120
ProbableThe movement in the Seamaster Diver 300M of the 1990s, including the reference that made the model famous. Calling it an ETA is accurate and is not a criticism: the 2892-A2 is among the most reliable automatics ever industrialised, and Omega's contribution was finishing, adjustment and chronometer certification rather than architecture. The identification matters because it fixes what the movement should LOOK like — a 2892 bridge layout and rotor, decorated to Omega's specification and signed by Omega, not an Omega-designed architecture.
Specifications
- Movement manufacturer
- Omega
- Base caliber
- ETA 2892-A2
- Production
- 1993–2007
- Frequency
- 28,800 vph (4 Hz)
- Jewels
- 23
- Power reserve
- 44 hours
- Winding
- automatic
- Complications
- Centre seconds · Date
- Certification
- COSC chronometer
Architecture
ETA 2892-A2 finished, adjusted and chronometer-certified by Omega. Automatic, centre seconds, quickset date, 21 jewels in Omega's execution.
Service practice
Because the base is a mass-produced ETA, generic 2892 service parts fit. A 1120 rebuilt with undecorated generic components will run correctly and will not look right; the difference is an originality finding rather than an authenticity one, and should be reported as such.
Related calibers
Built on
ETA 2892-A2Succeeded by
Omega 2500
References using this caliber
- Omega 2531.80.00Factory
Seamaster · Whole production
Provenance of this record
Sources & Evidence
OMEGA Vintage Database
OMEGA SA
- Accessed
- 2026-08-18
Cited for
Ranfft Watch Movement Archive
Dr. Roland Ranfft (archived and maintained by volunteers)
- Accessed
- 2026-08-18
Cited for
COSC — Contrôle Officiel Suisse des Chronomètres: testing criteria
COSC
- Accessed
- 2026-08-18
Cited for
Last verified: Not yet reviewed