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A. Lange & Sohne

A. Lange & Sohne Lange 31 45.9mm 130.025

A. Lange & Sohne Lange 31 45.9mm 130.025

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Condition New/Unworn
Case Shape Round
Case Dimensions 45.9mm
Case Thickness 15.9mm
Case Material Platinum
Dial Color Rhodium
Crystal Scratch Resistant Sapphire
Screw-in Crown No
Water Resistance
No rating Does not allow contact with water
30m/99ft - 50m/165ft Allows for contact with water such as washing hands and rain
50m/165ft - 100m/330ft Allows for light poolside swimming
100m/330ft - 200m/660ft Allows for swimming, snorkeling and showering (do not expose to hot water)
200m/660ft - 500m/1650ft Allows for impact water sports such as board diving and scuba diving
500m/1650ft + Appropriate for serious deep water diving.

Learn more about Water Resistance.

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30m/99ft
Case Back Transparent
Band Material Alligator/Crocodile Leather
Color/Finish Black
Clasp Deployant Buckle
Movement Manual Wind
Complications Power Reserve Indicator
The Lange 31 – with an amazing 31 day power reserve!
One  of the most challenging aspects in production of mechanical wristwatches is the duration of the Power Reserve, understandably the longer the Power Reserve the more convenient it is to the wearer. Thus most top brands invest considerable time, effort & funds into developing a mechanism that can store the most amount of energy within the constraints of a wristwatch case size. Storing energy is only half of the challenge, as the torque in the spring will fluctuate considerably (especially in watches with larger power reserves), which in turn will have a negative impact on accuracy. Thus an equally challenging feat is  to take the stored energy and transfer it to the movement in a controlled and uniform manner.
Enter the LANGE 31, Lange presents  the world’s first mechanical wristwatch with a power reserve of 31 days and a patented constant-force escapement. The double stacked mainspring barrels, each with an impressive 185cm long spring, store the energy. A constant-force escapement between the twin mainspring barrels and the going-train assures that the balance receives an identical amount of energy every ten seconds, regardless of the state of wind of the springs!
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