Patek Philippe Retrograde Perpetual Calendar Ref. 5159 R – 001 No. 7295671/6313587, circa 2020 A 18k pink gold automatic retrograde perpetual calendar with moon phases, pink deployant clasp Case: round shape, hinged vase back, signed Dial: grey silvered, black Roman numerals, centre seconds, retrograde date indication, aperture for days of the week and months (English), bissextile year indication, outer minute track, signed Movement: automatic, stamped PP, Côtes de Genève decoration, 30 jewels, calibre 324, rotor stamped with the Calatrava cross, signed Buckle/Clasp: 18k pink gold deployant clasp, signed Dimensions: 38 mm Weight: 109,1 g Accessories: certificate of origin dated October 1st, 2020, presentation box and outer packaging, Patek Philippe leather cardholder including leaflet for retrograde perpetual calendar caliber 324 S QR and product literature Provenance: from the original owner The Patek Philippe Reference 5159R represents one of the most sophisticated expressions of Haute Horlogerie, combining the perpetual calendar complication with a retrograde date display in a rose gold case. Technical Specifications: Movement: Caliber 324 S QR, self-winding mechanical movement Complications: Perpetual calendar with retrograde date, moon phases, leap year indicator Case: rose gold with sapphire crystal caseback Display: The retrograde date hand sweeps across a 180-degree arc before instantly jumping back to the beginning of the month Power Reserve: Approximately 45 hours Notable Features: The retrograde mechanism adds exceptional visual appeal to the perpetual calendar function. Unlike traditional date displays that advance incrementally, the retrograde hand creates a graceful arc across the dial before its dramatic return to position one. The perpetual calendar automatically accounts for varying month lengths and leap years until the year 2100, requiring no manual adjustment during this period. The moon phase indication maintains accuracy for 122 years before requiring a one-day correction. Historical Context: This reference exemplifies Patek Philippe’s mastery of complex complications, representing decades of horological refinement. The combination of perpetual calendar and retrograde display demonstrates the manufacture’s ability to merge technical prowess with aesthetic sophistication.