The Tank family is instantly recognizable thanks to its straight lines and sharp angles. However, the Tank Arrondie (French for "rounded") subtly diverges from this signature design. By softening the corners of the classic Tank, the Arrondie adopts a faint hint of a "round-on-squared" shape. This particular model in 18 k yellow gold has some rarer features—let us elaborate: the dial features a fine silver guilloché pattern, not often seen! On the dial, you’ll find the hidden Cartier signature at 7 o’clock, along with black-printed Roman numerals, in typical Cartier style. The movement is based on the ultra-thin mechanical Caliber 21, created by the renowned Swiss watchmaker Frédéric Piguet. Frédéric Piguet was one of the pioneers in the ultra-thin wristwatch category, debuting the Caliber 21 in 1925. With a diameter of just 20.4mm and a thickness of 1.73mm, it set a new benchmark for compact watchmaking. In the mid-1950s, a collaboration between Vacheron Constantin, Audemars Piguet, and Jaeger-LeCoultre led to the development of a new ultra-thin movement designed for mass production. Known as the Jaeger-LeCoultre 803, Audemars Piguet 2003, and Vacheron Constantin 1003, these movements measured 21.05mm in diameter and 1.64mm thick. Remarkably, an upgraded version of this movement continues to be produced today! So, we have a movement that is nearly one hundred years old.. This Tank Arrondie is fitted with a fine Bulang & Sons strap and the watch has been fully serviced by our watchmaker. Our love for these classic Cartiers runs deep—get in touch to learn more! Specifications: - Cartier Tank “Arrondie” Reference 896041- 18k yellow gold case in 23x 29 mm- Serial 23xx dating the 1990s- Silver guilloché dial with painted Roman numerals- Serial number 17001xxxx, dating to the 1970s- Bulang ands ons leather strap- Manual wound ultra thin movement , based on a F.Piguet caliber 21- Fully serviced by our watchmaker- One-year mechanical warranty- Free worldwide FedEx Priority shipping