The 40mm case diameter provides a noticeable presence on the wrist. It offers a larger and more substantial look compared to the smaller variations of the replica Datejust, such as the 36mm and 34mm sizes. The increased size can be appealing for those who prefer a bolder and more modern aesthetic. It allows for larger hour markers, hands, and a more prominent date window. This improves legibility, making it easier to read the time and date at a glance. The Cyclops magnifying lens positioned over the date window further enhances visibility.