The Rolex Day-Date 18206 is the line in one of its most formal forms: a 36mm platinum case, matching platinum bracelet, and a silver Roman dial with a clean, balanced layout. The signature day and date display gives it the function that defines the model. Its automatic movement fits the watch's weighty, understated feel. At 12mm thick and 43mm lug to lug, it wears compact and dense on the wrist.