Introduction and Launch: The Rolex calibre 3180, introduced in 2014, is a self-winding movement entirely developed and manufactured by Rolex. It powered the Cellini Dual Time, offering simultaneous timekeeping in two different time zones. A key feature of the 3180 is its refined sun-and-moon day/night indicator, displayed within a sub-dial, providing a clear visual distinction between day and night for the secondary time zone. This movement exemplifies Rolex’s expertise in combining functionality with timeless sophistication.