Patek Philippe introduces a new complication to its calendar watches: the weekly calendar, a semi-integrated mechanism displaying the current week number, in addition to the day and date. A particularly useful feature for the modern businessman. This steel Calatrava Weekly Calendar also houses a completely new self-winding movement with optimized performance. The dial is notable for its exclusive letters and numerals which authentically reproduce handwritten characters.

A new complication in a steel case. Silvery opaline, blackened gold applied hour markers. Steel. Diameter: 40 mm. Height: 10.79 mm. Water-resistant to 30 m. Sapphire crystal case back. Calfskin, hand-stitched, light brown. Prong buckle. Weekly calendar. Day and week number by hands. Date in an aperture. Sweep seconds hand.

Weekly calendar. Date. Sweep seconds hand. Diameter: 27 mm. Thickness: 4.82 mm. Number of parts: 304. Jewels: 50. Power reserve: min. 35 hours – max. 45 hours. Central rotor in 21K gold, unidirectional winding. Balance: Gyromax^®. Semi-oscillation/hour: 28 800 (4 Hz). Balance spring: Spiromax^®. Hallmark: Patek Philippe Seal.