A. Lange & Söhne Lange 31

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  A. Lange & Söhne Lange 31
  The world's first mechanical wristwatch with a power reserve of 31 days and a constant-force escapement that powers the going train with constant torque delivery. The tremendous amount of energy needed to keep the watch running so long is transferred to the movement with a winding key and stored in a twin mainspring barrel.
  Models
  • A. Lange & Söhne Lange 31 The Lange 31
    • 130.025
  
  
  
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