As early as 1910 Audemars Piguet began applying its watchmaking expertise to complex complications, paying special attention to the perpetual calendar in pocket watches and then in 1955 in wristwatches. A sophisticated movement, the perpetual calendar, unlike a simple calendar, is engineered to make adjustments throughout the year for the varying lengths of each month and account for leap years. Continuing their haute horology tradition of ‘Breaking the Rules,’ Audemars Piguet presents a novel collection of four Royal Oak Perpetual Calendars.

The highlight of the range is the new self-winding caliber 5134 fitted in a larger—though still slim—41mm case. Caliber 5134, based on its predecessor caliber 2120, measures 4.31mm in thickness and has a 40-hour power reserve. This caliber powers not only the hours and minutes, but also the perpetual calendar with week, day, date, moon, month and leap year indications.  These are displayed via the traditional dial of the Royal Oak collection, with the week indication along the outer chapter using a central-mounted hand. The Royal Oak Perpetual Calendar is offered in rose gold or stainless steel with a Grande Tapisserie dial in either silver or blue.

To view the decorated movement in all its glory, simply turn to the sapphire caseback to enjoy the fine finishes—from the beveled edges on the bridges and satin-brushed wheels, to the suspended barrel decorated with circular Côtes de Genève. Adding to the hand-finishing, the 22-carat gold monobloc oscillating weight is engraved with “Audemars Piguet,” and the tapisserie motif on its rim is reminiscent of the Royal Oak collection dials.

Tags: Audemars Piguet, Royal Oak Perpetual Calendar, Royal Oak