Cartier 21 Must de Cartier

wristwatch "must de Cartier",

Model "21". Barrel-shaped case and bracelet with double folding clasp made of 18 kt yellow gold stainless steel, bezel with gold-plated Roman numerals and railway minute track. Beige dial with date window at 6 o'clock and blued hands. Crown with a blue cabochon. Quartz movement. Six-fold screwed caseback with must de Cartier 21 and number 901148870. Obvious signs of wear such as nicks and scratches. Diameter 3.4 cm, length approx. 19 cm. Included: papers in a case with a Cartier Joailliers, Berlin, certificate dated June 3, 1991, two extension links (total approx. 1.2 cm), and the original case.