The LANGE 31 is the first mechanical wristwatch with a power reserve of 31 days. Additionally, it features a patented constant-force escapement, which makes it possible for the first time to actually harness such an extreme power reserve. This mechanism assures high rate stability and thus consistent rate accuracy for an entire month.
Hours and minutes; subsidiary seconds with stop seconds; outsize-date display; power-reserve indicator, 31 days power reserve
Diameter: 45.9 millimetres; height: 15.9 millimetres