The Blancpain Villeret Calendrier Chinois Traditionnel was introduced in 2013 as the first ever mechanical wristwatch to be fitted with a traditional Chinese calendar. It is powered by the self-winding caliber 3638, which needs some 463 parts in order to accomplish this feat. Reference 00888-3431-55B has a platinum case and a white enamel dial. It is limited to 20 pieces a year.
