The Patek Philippe reference 6000 is one of the manufacture's most distinctive Calatrava models, combining classical dress watch elegance with an unconventional display layout and one of Patek Philippe's most practical complications. Introduced in 2005, the 6000 is powered by the automatic Calibre 240 PS QA, featuring the manufacture's patented Annual Calendar, which automatically differentiates between 30 and 31-day months and requires correction only once each year at the end of February. Its unique dial is characterised by an off-centred time display, a retrograde date indication and apertures for the day and month, creating a bold yet highly legible interpretation of the Annual Calendar complication. Produced in white gold, yellow gold and rose gold, with a variety of dial colours and guilloché finishes throughout its production, the 6000 has become one of Patek Philippe's most individual modern references, admired for its innovative display, technical sophistication and distinctive take on the timeless Calatrava collection.