Greubel Forsey opens new horizons with a revolutionary interpretation of one of the oldest watchmaking complications — the Perpetual Calendar. The inventive watchmakers in La Chaux-de-Fonds have also incorporated the Equation of Time in a demonstration of how to add complexity of function while simplifying with clear legibility and easy operation. http://www.wthejournal.com/en/en-direct/article/greubel-forsey-qp-a-equation

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