The Patek Philippe Cubitus 5840P-001 is the most technically ambitious watch in the maison's newest collection, pairing the squared Cubitus case with a skeletonized perpetual calendar. This distinguished timepiece features a 45mm platinum case measuring just 10mm thick, with a screw-down crown, a sapphire crystal case back, and a baguette-cut diamond set into the case at 6 o'clock, Patek's signature marker of a platinum piece. The captivating sunburst blue openworked dial is cut with a horizontal line pattern that reveals the movement beneath, set with applied white gold baton-style hour markers and rounded white gold baton hands, both finished with white luminescent coating. Powered by the self-winding Caliber 28-28 Q SQU, a skeletonized perpetual calendar built from 313 parts with 27 jewels, it displays day, date, month, leap year, and 24-hour indication by hands alongside a moon-phase display. A rhodium-plated 22K gold off-center mini-rotor drives a power reserve of 38 to 48 hours, the escapement runs on a Gyromax balance and Spiromax balance spring at 21,600 semi-oscillations per hour, and the movement carries the Patek Philippe Seal. A navy blue composite strap with a fabric pattern completes the watch, secured by a platinum fold-over clasp. Water-resistant to 30 meters, the Cubitus 5840P-001 puts one of watchmaking's most demanding complications into a case shape Patek had never built before.