The Patek Philippe reference 5396 is one of the manufacture's most refined Annual Calendar models, combining elegant styling with one of Patek Philippe's most practical and celebrated complications. Introduced in 2006, the 5396 showcases the patented Annual Calendar mechanism, which automatically differentiates between 30 and 31-day months and requires correction only once each year at the end of February. Powered by the automatic Calibre 324 S QA LU 24H/303, the watch features a beautifully balanced dial with day, date and month displayed through apertures across the top of the dial, complemented by a moon phase and 24-hour indication at 6 o'clock. Produced in white gold, rose gold and platinum, with a variety of dial colours and configurations throughout its production, the 5396 has become one of the most recognisable modern Patek Philippe complications, admired for its timeless design, everyday practicality and exceptional mechanical craftsmanship.