The Patek Philippe reference 5204 is one of the manufacture's most prestigious Grand Complication wristwatches, combining a split-seconds chronograph with a perpetual calendar in one of the most technically sophisticated timepieces in the collection. Introduced in 2012, the 5204 succeeded the legendary reference 5004 and was the first split-seconds perpetual calendar chronograph to be powered by Patek Philippe's fully in-house manually wound Calibre CHR 29-535 PS Q, incorporating a column wheel, horizontal clutch and numerous patented innovations to enhance precision and reliability. Its beautifully balanced dial features twin apertures for the day and month, a pointer date surrounding the moon phase at 6 o'clock, leap year and day/night indicators, together with a classic two-register split-seconds chronograph layout that delivers outstanding legibility despite its remarkable mechanical complexity. Produced in white gold, rose gold and platinum, with a variety of dial colours throughout its production, the 5204 has become one of Patek Philippe's most admired contemporary Grand Complication references, celebrated for its exceptional technical innovation, exquisite finishing and timeless interpretation of one of the manufacture's most iconic complications.