This watch strap is compatible withPatek Philippe Nautilus Collection 5726A-001 Watch (Nautilus)and Patek Philippe Nautilus Collection 5712R-001 Watch (Nautilus) and Patek Philippe Nautilus Collection 5711/1A-010 Watch (Nautilus). All leather straps are hand-customized: the front side is made of genuine crocodile leather, while the back side uses genuine cowhide leather. The strap is crafted with a full-edge wrapping technique through pure handwork, and its stitching is also done by hand.