A. Lange & Sohne
A. Lange L951.1
Swiss lever · introduced 2005
Beat rate
21,600 vph
Power reserve
36h
Jewels
54
Introduced
2005
Escapement
Swiss lever
The L951.1 is the perpetual calendar movement in the Lange 1 Perpetual Calendar, combining A. Lange's signature outsize date with a perpetual calendar that accounts for all months and leap years through 2100. Every component is individually hand-finished and regulated. The movement carries blued steel screws, chamfered and polished gold chatons, and a German silver three-quarter plate as Lange standards.
Specifications
Beats per hour
21,600
Jewels
54
Power reserve
36h
Diameter
30.0mm
Height
6.1mm
Escapement
Swiss lever
Introduced
2005
Finishing
Haute horlogerie
Service interval
5 years
Service cost tier
Haute
Complications
perpetual calendaroutsize datemoonphasemanual wind
Known service issues
- The perpetual calendar mechanism must be advanced correctly at service; incorrect advance at the end of February in a non-leap year can damage the program wheel
- Factory service times can exceed six months due to the hand-finishing requirements at reassembly
Notable in
- A. Lange & Sohne Lange 1 Perpetual Calendar 101.025
- A. Lange & Sohne Lange 1 Perpetual Calendar 101.032
Buying advice
Practical guides for buying a watch with this caliber on the pre-owned market: