A. Lange & Söhne · Datograph
L951.6
A hand-wound flyback chronograph with an outsize date and jumping minute counter.
At a glance
- Type
- Hand-wound mechanical
- Display / complication
- Chronograph
- Architecture
- Column wheel, flyback, precisely jumping minute counter
- Timebase
- 18,000 vph / 2.5 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
A. Lange & Söhne Datograph Up/Down
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
The chronograph’s minute counter jumps at the completed minute. The flyback mechanism lets timing restart through a single reset action, unlike an ordinary stop-reset-start sequence.
For the enthusiast
The Datograph Up/Down adds a power-reserve display. Its 2.5 Hz rhythm is a reminder that high-end watchmaking is not simply a race for the highest frequency.