Description: Rolex Day-Date 18238 Pre-owned Rolex Day-Date 36 ref 18238 (1990) is the quintessential gold Rolex and the watch most people picture when they think of a Day-Date. Solid yellow gold, 36mm case, and that bold yet sophisticated presence on the wrist. It replaced the ref 18038 and introduced the caliber 3155, bringing with it the convenience of a Double Quickset function for both the day and date. It’s a seemingly small upgrade, but one that makes a big difference