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Patek Philippe watches keywords Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches, Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches, Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches, Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches, Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches, Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches, Patek Philippe Calatrava Collection, Patek Philippe Complicated, Patek Philippe Calatrava Collection, Patek Philippe Gondola Collection, Quartz Model 4824J, Patek Philippe Golden Ellipse Collection, Patek Philippe Twenty-4 Collection, Patek Philippe watches. Patek Philippe launched its patented Annual Calendar in 1996. It is said to be ‘useful’ because it is practical, easy to use, and very readable. The Annual Calendar was, in fact, the first wristwatch to automatically display the month, day and date for all the months of the year that had 30 and 31 days. The only exception was February, of course, which required one correction per year. To make this timepiece, the watchmakers at Patek Philippe replaced the usual cams and levers by gear trains. As a result, the Annual Calendar has more component parts (330) than the brandÍs Perpetual Calendar that comes with lunar phases (275 parts). Although its design is very sophisticated, its rationalized architecture makes the piece less complex to assemble. The flagship of the family of ‘useful’ complications, the Annual Calendar, named Watch of the Year in 1996, enjoyed very rapid success, so much so that even women were wearing the 37 mm diameter timepiece, although it was originally intended for men. Its ease in use, its ingenuity, and its classic appearance all contributed to the high degree of acceptance by the public. In 1998, Patek Philippe added a power reserve indicator and a high precision lunar phase display to the Annual Calendar. The moon phase display is so accurate that it is off by only one day every 122 years.