The Patek Philippe reference 5135, known as the Gondolo Calendario, is one of the brand's most distinctive modern complications. Introduced in 2004, it combines an elegant Art Deco-inspired tonneau-shaped case with Patek Philippe's renowned Annual Calendar complication, requiring adjustment only once each year at the end of February. The dial features three apertures displaying the day, date and month, complemented by a moon phase and 24-hour indicator. Powered by the automatic Calibre 324 S QA LU, the 5135 showcases exceptional finishing and everyday practicality. Produced until 2011, the reference remains highly collectible for its unique design, technical innovation and understated elegance.