Launched in 1997, the Patek Philippe Aquanaut is a casual sports watch collection, which combines modern design with enduring elegance.... Easily identifiable through their rounded octagonal case shapes, the timepieces offer supreme water resistance of up to 120m, while the screw down crown offers protection for those with active lifestyles. Most of the men's watches have 40mm case sizes, while ladies' models have case sizes of approximately 35mm, although other sizes have been made available at different points, including a large 41.5mm men's model. Read more Show less