Lange L034.1 is a caliber by A. Lange & Söhne.
Hand-wound manufacture movement with small seconds, big date and power reserve indicator.
World's first mechanical caliber with a power reserve of 31 days and a constant-force escapement. The two mainsprings located in the double barrel are five to ten times longer than conventional mechanical wristwatch movements, each measuring 1,850 millimeters.
Used in the A. Lange & Söhne Lange 31 model.
Functions:
Data:
Production period:
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