If there was one timepiece synonymous with the last decade, it was the chunky tourbillon, whirring and spinning ostentatiously whilst suspended high above the wrist. But lately the bulky, macho watch has competition, as the thin dress watch has emerged as an unlikely candidate of cool, no longer just a suit-and-tie accessory. Leading the pack is Piaget, the original arbiter of slim, with its Altiplano, which was created in 1957 and currently holds the world record for thinnest automatic mechanical watch, at 5.25 millimeters (the equivalent of three quarters). At this year’s Salon International de la Haute Horlogerie in Geneva, Piaget added the Altiplano Date, which holds the world’s thinnest automatic movement with date (3 millimeters, with a 6.36-millimeter case). Other brands have also been sizing down: Last year, Patek Philippe introduced a new Calatrava inspired by a lighter late-1950s model, and Vacheron Constantin’s Ultra-Fine 1968 is more than a millimeter thinner than the original.