Description With its self-winding Patek Philippe caliber 324 S QR movement, the Ref. 5159 is a rare perpetual calendar with a retrograde date and sweep seconds. In keeping with the manufacture's tradition, the magnificent "officer's style" case in rose gold has a hinged cover that protects the case back. * Mechanical self-winding movement * Caliber 324 S QR * Perpetual calendar * Retrograde date hand * Day, month, leap year in apertures * Moon phases * Sweep seconds hand * Opaline-white dial, hand-guilloched center, black Roman numerals * Fold-over clasp * Sapphire-crystal case back protected by a hinged cover * Water resistant to 30 m * Yellow Gold * Case diameter: 38 mm CALIBER 324 S QR * Perpetual calendar with retrograde date hand * Day, month, leap year in apertures * Moon phases * Center sweep second hand * Overall diameter: 28 mm * Height: 5.25 mm * 30 jewels, 9 bridge