Patek Philippe Nautilus 5712A has arrived. The world's most expensive porthole watch, inspired by portholes, features a non-circular and non-square bezel with rounded corners, resembling an octagonal shape. The protruding shoulder hinges on both sides are vividly likened to ears. The case is not a modern three-piece structure made up of a case back, bezel, and case ring, but rather a single-piece construction made from a solid block of stainless steel, with only a small opening for the mainspring winding stem. The crystal bezel is securely fastened to the case with four screws. It is equipped with a fully automatic multifunctional imported movement and has a diameter of 40mm.