Jaeger-LeCoultre · 866
866AA
The modern Master Control Calendar movement combines a triple calendar, moon phase and a 70-hour reserve.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Complete calendar
- Architecture
- Automatic winding, day and month windows, pointer date, small seconds and moon phase
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- 70 h
- Movement height
- 6.15 mm
- Jewels
- 34
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
Jaeger-LeCoultre Master Control Calendar Q4148450
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
A complete or triple calendar displays day, date and month; it still needs date correction after months shorter than 31 days. The moon-phase display tracks a separate lunar cycle.
For the enthusiast
The cited watch identifies the movement as 866AA, while its explanatory text uses the broader name 866. These figures describe the modern 70-hour execution, not every earlier calibre bearing the family name.