The seller represents this timepiece as being in very good condition. This timepiece received service in February 2026, including complete movement service, refinishing, regulation, replacement components, and pressure testing. This auction includes the watch and papers; the boxes are not included in the listing. 

An exceptionally rare and highly collectible Cartier Tonneau XL CPCP in solid platinum, featuring the coveted manual-wind Jaeger-LeCoultre-based caliber 9790MC. Unlike the standard production Tonneau references of the era, the reference 2435E belongs to Cartier’s legendary Collection Privée Cartier Paris (CPCP) line — a low-production series created for collectors and enthusiasts, showcasing Cartier’s highest level of traditional watchmaking during the early 2000s. This is not the standard ETA-powered Tonneau. The 2435E features the superior-shaped caliber 9790MC, a beautifully thin hand-finished movement based on a Jaeger-LeCoultre ébauche and specifically designed to follow the elegant curved Tonneau case architecture. The watch also benefits from the more refined CPCP execution, including the “Cartier Paris” dial signature, deeper guilloché work, and elevated overall finishing throughout the case, dial, and movement. The platinum Tonneau XL itself is one of the most elegant and understated dress watches Cartier has ever produced. At 26mm x 39mm, it wears with incredible presence while maintaining classic proportions true to the historic Cartier aesthetic. The CPCP series has become one of the most collectible modern eras of Cartier, and the platinum Tonneau XL remains one of the purest expressions of Cartier’s historic design language combined with true haute horlogerie movement pedigree. A serious collector’s piece that rarely surfaces in this configuration.