This Rolex Day-Date reference 128238 carries the flagship calendar watch into the current 36mm case. Its self-winding caliber 3255 brings the latest Day-Date generation a longer power reserve and the Chronergy escapement, while the calendar display remains the signature that has defined the model since its introduction. In 18k yellow gold the case measures 36mm across and 12mm thick, a size that keeps the watch exactly where the line has always made its strongest case to the collector who wants the classic proportion rather than the larger alternative. The green baguette dial sharpens that stance further, giving this watch a more formal structure than the standard baton layout. Rolex updates the Day-Date carefully, and that restraint is part of the point here. This reference keeps the model's core identity intact while delivering the mechanical advances of the current generation in its most traditional format.