Rolex Datejust 31mm Green 10 Diamond Steel Rolesor Jubilee 278273Overview The Datejust introduced the automatic date display and the Jubilee bracelet together in 1945 both designed as a single proposition from the outset. That lineage matters for the 278273 because it positions this reference not as a ladies' watch with dressed up features, but as the mid size expression of Rolex's most historically grounded dress model. The 31mm sits between the Lady Datejust 28 and the 36mm, and in the Rolesor configuration with