The Patek Philippe reference 5235 is one of the manufacture's most technically innovative modern Regulator Annual Calendar wristwatches, combining the practicality of an Annual Calendar with the distinctive regulator-style display. Introduced in 2011, it was the first Patek Philippe to feature a regulator dial as part of the permanent collection, with separate indications for the hours, minutes and seconds providing exceptional legibility and a unique aesthetic. Powered by the automatic Calibre 31-260 REG QA, developed specifically for this reference, the movement incorporates advanced technologies including the Pulsomax® escapement and delivers outstanding precision and efficiency. The dial is complemented by the patented Annual Calendar complication, displaying the day, date and month while requiring correction only once each year at the end of February. Produced initially in white gold and later in rose gold, the 5235 has become one of Patek Philippe's most distinctive contemporary references, admired for its innovative movement, elegant proportions and unique interpretation of the Regulator display combined with one of the manufacture's most practical complications.