Calibre 2260 signals Vacheron Constantin’s determination to develop a tourbillon movement offering peerless performance. It has a 14-day power reserve made possible by a system of four barrels mounted in pairs. Each 2.20 mm spring enables approximately 13 development rotations. Together, they unwind four times more slowly than a single barrel. A “dragging” hand displays the remaining energy on a remarkably readable 280° sector.