Patek Philippe is adding a brand-new perpetual calendar with an original in-line display to its rich range of calendar watches. The day, date and month appear in a large single aperture at 12 o'clock. So as to combine originality, legibility and reliability, the watch design engineers have developed the new self-winding movement 31-260 PS QL with an additional in-line display module, for which three patent applications have been filed. This highly sophisticated new caliber is housed in an elegant platinum case framing a vertical satin-finished blue dial with a black-gradient rim.

Blue, black-gradient, vertical satin finish, gold applied hour markers. Platinum. Diameter: 41.3mm. Height: 11.07mm. Water-resistant to 30 m. Interchangeable solid and sapphire crystal case backs. Alligator leather with square scales, hand-stitched, shiny navy blue. Fold-over clasp. In-line perpetual calendar. In-line perpetual calendar. Day, date, month, leap year and day/night indication in apertures. Small seconds. Moon phases.

In-line perpetual calendar. Day, date, month, leap year and day/night indication in apertures. Small seconds. Moon phases. Diameter: 34 mm. Thickness: 5.8 mm. Number of parts: 503. Power reserve: min. 38 hours - max. 48 hours. Winding rotor: off-center platinum minirotor. Frequency: 28,800 semi-oscillations/hour (4 Hz). Hallmark: Patek Philippe Seal.