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A. Lange & Söhne Video. Richard Lange Perpetual Calendar "Terraluna"

The film explains how this extraordinary timepiece works.

The Richard Lange Perpetual Calendar “Terraluna” features an orbital moon-phase display, a perpetual calendar with outsize date, a power-reserve of 14 days, and a constant-force escapement.

Anthony de Haas explains how it works.


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