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SAXONIA family

LANGE 31 reference 130.039

Power reserve: 744 hours

The LANGE 31 is the world’s first mechanical wristwatch with a power reserve of 31 days and a patented constant-force escapement. To deliver a power reserve of this magnitude, the movement must be able to store a large amount of energy. This task is handled by two mainsprings that are both 1850 millimetres long – about ten times as long as in mechanical wristwatches with a conventional power reserve.

Close-up of movement L034.1 of the LANGE 31

Movement L034.1

Mainsprings of this length imposed considerable challenges on the engineers. The first obstacle was to transmit their tremendous energy to the movement in a gentle and uniform manner. For this purpose, they developed a patented constant-force escapement. The second challenge presents itself when winding the watch, a very time-consuming and cumbersome task, given the length of the springs. This is why the LANGE 31 is wound with a key. It generates much more leverage than a winding mechanism based on a crown.

Explore further

Power-reserve indicator
Power-reserve indicator
The UP/DOWN display reminds the owner to rewind the watch before it stops running.
Outsize date
Outsize date
The A. Lange & Söhne outsize date enables a date display with digits around three times as large as those in watches of comparable dimensions.
Manufacture movements
Manufacture movements
Every A. Lange & Söhne timepiece is equipped with a manufacture movement. To be more precise: all calibres are developed, crafted, finished and assembled in our manufacture in Glashütte. Because it is our clear commitment to exclusively use our own movements.

How can we be of service?

Whether you are in search of a specific model, have questions out of interest or need a service request for your timepiece – we are delighted to help you. We are at your service by phone, email or in one of our boutiques.

The A. Lange & Söhne salon in Zurich