Vacheron Constantin Tour de l’Ile – $1.5 million

Built to commemorate the brand’s 250th anniversary, Vacheron Constantin’s Tour de l’Ile was in 2005 the most complicated wristwatch in the world. Though it lacked a chronograph, this tourbillon/minute repeater/perpetual calendar was fitted with an expansive range of astronomic functions. The watch’s perpetual calendar appears on the reverse side, along with sidereal time—expressed in a […]