Case size: width 23 mm / height 23 mm Beautiful rare version of the tank series. This is an extra flat version of the tank, named Ellipse, which was only issued twice in this series. The first time in manual version, and a later quartz version. This is the fully manual version. This model was bought in 1980 and can be seen as a collector's item, especially in this condition. In December 2018 the timepiece was entrusted to Cartier for a full revision. Hear all the parts suffering from age-related wear were removed. The winding system, the hands, the dial, the winding crown, various screws, all packings, check for magnetism and water and waterproofness, closing mechanism. Everything done and serviced by Cartier. In total the repairs cost €1180, so you could call it a historical timepiece in new condition and with a 24-month warranty by Cartier. Some things are worth to preserve...