Oris · Calibre 400 series
400
Oris’s five-day automatic, with twin barrels and a date display.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Date
- Architecture
- Twin barrels, slide-bearing rotor
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- 120 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
Oris Aquis Date Calibre 400
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
Two barrels each contribute roughly two and a half days of running time. The winding rotor uses a low-friction slide bearing rather than the usual ball-bearing arrangement.
For the enthusiast
The 400-series name also covers different displays and winding arrangements. Compare the exact calibre; a five-day reserve does not mean every member has the same functions.