Longines · L687
L687
A calendar chronograph familiar from the Master Collection, combining day, date, month and moon phase.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Complete calendar
- Architecture
- Column-wheel chronograph, pointer date, day and month windows, moon phase and 24-hour indication
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- Approx. 66 h (cited execution)
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
Longines Master Collection L2.673.4.78.6
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
Longines specifies a date correction after every month shorter than 31 days. Its 24-hour display helps distinguish morning from evening; it is not an independently adjustable second time zone.
For the enthusiast
The linked Longines product sheet documents the 66-hour L2.673.4.78.6 execution. Reserve figures can vary with generation. Follow the exact watch manual when setting its calendar; the manufacturer gives specific restricted correction hours.