Cartier back-wind wristwatch, 1920's, the cocktail watch with lozenge shaped 18ct gold case, white dial with black Arabic numerals and blued steel hands, fluted 18ct gold shoulders, on a double strand leather bracelet with an 18ct gold and enamel deployant clasp, small 'Duoplan' European Watch & Clock Co. movement, dial signed Cartier, serial no.05950, case no.