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Audemars Piguet retires its automatic perpetual calendar movement
Audemars Piguet is calling time on its Calibre 5135 automatic perpetual calendar movement, which has been at the heart of its most complicated timekeepers for the past decade. The movement is given a swansong in a limited edition Royal Oak Perpetual Calendar Openworked limited edition that arrives 150 years after AP made its first perpetual […]