Omega · 99 series
9900
An automatic Co-Axial chronograph with a column wheel, twin barrels and time-zone adjustment.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Chronograph
- Architecture
- Column-wheel chronograph, two barrels in series
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- 60 h
Reference sources reviewed 7 November 2026. Published specifications, not independent measurements. Versions and complete-watch specifications can differ; fields without a verified figure are omitted or identified.
Find it in a watch
Omega Speedmaster Racing, 329.33.44.51.04.001
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
The column wheel coordinates the chronograph controls, while two series-connected barrels store energy. Its chronograph records up to twelve hours, with a small-seconds display for ordinary running time. The 4 Hz balance is distinct from the hand-wound Moonwatch 3861’s 3 Hz rhythm.
For the enthusiast
Omega uses 9900 in references including the Speedmaster Racing. Do not confuse a shared Speedmaster name with a shared calibre: winding, reserve and indications differ. The linked reference is Master Chronometer certified, with magnetic resistance specified to 15,000 gauss.