The Rolex Oyster Perpetual Day-Date is an iconic watch that hardly needs an introduction. Only ever available in precious metals (save for a few prototypes), it was for many years the undisputed king of the Rolex collection and the singular most recognizable 'expensive' watch to the general public. In its present form, the case measures the traditional 36mm. It is driven by caliber 3155.Reference 118388-0025 has a yellow gold case with diamond-set bezel and lugs, and a President bracelet with diamond-set center links.