Greubel Forsey makes more tourbillons per watch than anyone except maybe Vacheron Constantin's haute complications atelier. The brand's entire identity rests on tourbillon construction, balance wheel innovation, and absolutely uncompromising hand-finishing. The Quadruple Tourbillon literally has four tourbillons running on different axes. For anyone planning to sell a Greubel Forsey...

The Sport Auto is Laurent Ferrier's most-traded reference because it's actually fillable. While the Galet Classic Tourbillon and Galet Annual Calendar School Piece appear rarely on the secondary market, the Sport Auto (introduced in 2018) has built enough production volume to actually circulate among collectors. For anyone planning to sell...

Some Roger Dubuis references are made in literally single-digit annual production. The Excalibur Single Flying Tourbillon variants, the Aventador Roadster collaborations, and the various exhibition-grade pieces operate at production levels well below mainstream haute horlogerie. That tiny production should support strong secondary values. In practice, it limits the buyer pool....