Rolex released the first Lady-Datejust in 1957, benefitting from identical groundbreaking features of the gent's version - the date function, automatic winding and waterproof case. Sizewise they shaved a full 10mm off the dimensions, delivering an elegant profile. This model went on to become the all-time bestselling watch Rolex has ever produced, outperforming even icons like the Submariner and the Daytona.