A. Lange & Söhne L951.1
High confidenceThe Datograph caliber. Two behaviours identify it at the bench and neither needs the case opened: the chronograph is a flyback, so pressing reset while running restarts it from zero without a stop; and the minute counter jumps precisely at the sixtieth second rather than creeping toward it.
Specifications
- Movement manufacturer
- A. Lange & Söhne
- Production
- 1999–?
- Frequency
- 18,000 vph (2.50 Hz)
- Jewels
- 40
- Power reserve
- 36 hours
- Winding
- manual
- Complications
- Chronograph · Flyback · Column wheel · Jumping minute counter · Outsize date
Architecture
Manually wound integrated flyback chronograph with a column wheel, a precisely jumping minute counter and an outsize date, in untreated German silver.
Related calibers
Succeeded by
A. Lange & Söhne L951.6
References using this caliber
- A. Lange & Söhne 403.035Factory
Datograph · Whole production
Provenance of this record
Sources & Evidence
Primary sourceManufacturer documentation
A. Lange & Söhne — collection and caliber specifications
Lange Uhren GmbH, Glashütte
- Accessed
- 2026-08-18
Cited for
This referenceHigh confidence
Last verified: Not yet reviewed