Never claiming the title, yet the first manufacturer to showcase it, the annual calendar complication has been an important and sought after feature by Patek Philippe since 1996. Capable of showing the correct length of the months, only needing adjustment once a year in February, the annual calendar complication is highly useful. Furthermore, it adds a power reserve and moon phase function, all packed into a 37mm case in 18ct white gold. The integrated five-row bracelet in high polished 18ct white gold with a double folding clasp, ads a solid heft and elegance to the watch.