Patek Philippe Annual Calendar 5396R Sector Dial in 18k Rose Gold Box and paper setThe Patek Philippe Reference 5396 Annual Calendar, introduced in 2006, represents a notable evolution in the brands development of the annual calendar complication. It blends the timeless elegance of the Calatrava style case with an innovative twin in line display for the day and month a layout inspired by Patek Philippes early perpetual calendars. This model was released to celebrate the 20th anniversary of the brands original patent for the annual