Cartier Duoplan Platinum 1930s Ladies WatchThe important micro JLC movement In a world where interesting Cartier pieces are some of the hottest pieces on the market, we have a truly rare and important example of an early Cartier France watch! This small cocktail watch houses one of the most important horological movements of the 20th century, the Jaeger Le Coultre calibre 101 Duoplan. Built on two levels to enable it to be kept tiny, the complete movement is the same size as a sharpened point