Patek Philippe Nautilus 5712A Arrival .The world's most expensive porthole-inspired watch, the Patek Philippe Nautilus features a unique octagonal shape with rounded edges, rather than the typical round or square designs. The protruding shoulders on both sides are cleverly likened to ears. The case is not a conventional three-piece structure made up of a case back, bezel, and case ring, but rather a single solid piece of stainless steel, with only a small opening for the winding stem. The crystal bezel is securely fastened to the case with four screws. It is equipped with a fully automatic multifunction imported movement and has a diameter of 40mm.
