The Patek Philippe reference 5320 is a perpetual calendar that pays tribute to some of the manufacture's most celebrated vintage timepieces while incorporating modern mechanical innovation. Introduced in 2017, it is powered by the self-winding Calibre 324 S Q, displaying the day, date, month, leap year cycle, day/night indication and moon phases. Its design draws inspiration from legendary perpetual calendar references of the 1940s and 1950s, combining a stepped case, box-style sapphire crystal, applied Arabic numerals and syringe-style hands to create a watch that is unmistakably vintage in character yet thoroughly contemporary in execution.

Produced in white gold and later rose gold, the reference 5320 has become one of Patek Philippe's most admired modern perpetual calendars. By blending classical aesthetics with an in-house automatic movement and exceptional Genevan finishing, it successfully bridges the gap between the manufacture's historic perpetual calendars and its contemporary Grand Complications collection. Today, the 5320 is regarded as one of the finest examples of vintage-inspired haute horlogerie, admired for its timeless design, everyday wearability and enduring collector appeal.