One of the most daunting challenges in the development of a mechanical wristwatch is to endow it with a particularly large power reserve. But the issue is not only how to store a relatively large amount of energy in the small dimensions of the cases. An equally important aspect is finding ways to return the energy to the going train in a controlled and uniform manner. Especially in watches with a large power reserve, the torque of the often multiple mainsprings of greater dimensions may fluctuate considerably, generally having a negative impact on the rate accuracy.

The master watchmakers at A. Lange & Söhne took on this challenge. Now, with the LANGE 31, they have presented a solution that meets the high Lange standards with regard to precision and perfection: the world’s first mechanical wristwatch with a power reserve of 31 days and a patented constant-force escapement. This makes it possible to use such a long period of autonomy in a relevant way for the first time.

THE MODELS