324 S C FUS AR

2017 Advanced Research execution of caliber 324 S C FUS; featuring a new Spiromax balance spring made of Silinvar; apart from the patented terminal curve (Patek Philippe boss at the outer end), its geometry now also features an inner boss near the integrated collet, and a ompliant (flexible) mechanism crafted from conventional horological steel that is used to set the second time zone in time-zone watches. . The new control mechanism for time-zone adjustments with flexible elements unites a number of advantages: simpler assembly (12 parts as opposed to 37), faster assembly (4 screws), flatter silhouette (1.24 mm versus 1.45 mm), no mechanical play, no friction, and no arbor wear, which assures completely lubricant-free functionality. On the other hand, these benefits impose greater requirements as regards conceptual complexity and production methods that call for more extensive know-how.