A friendship spanning 25 years, human endeavor, the summit of high-flying watchmaking expertise, and an unprecedented blend of talents have all come together in the Frederique Constant X Christiaan van der Klaauw Tourbillon Planétarium for ONLY Watch 2023 for the charity timepiece auction. This single piece features a Frederique Constant tourbillon and the brand’s remarkable manual finishings alongside Christiaan van der Klaauw’s planetarium —the smallest in the world and the first ever produced for a wristwatch.