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 which saw the model go on to become one of the all-time bestselling watches Rolex ever produced. The elements of elegance and boldness are now balanced with a slightly larger case size of 31mm. Giving the piece a little more presence on the wrist.