Patek Philippe have released the Ref. 5940, a self-winding perpetual calendar set in an eighteen carat gold cushion shaped case. This complex timepiece accounts for different durations of the months and features a caliber 240 Q movement. Ultra-thin and elegant, the Ref. 5940 is water-resistant to thirty meters, has a power reserve of forty-eight hours, and features an alligator leather watch strap.