From the Patek Philippe Aquanaut with its paradoxical rubber strap and steel body to the F.P. Journe Centigraphe Sport in its ultra-light aluminum case, casual elegance is the distinguishing element of this compilation of poolside-worthy watches. They are perfect for wearing out on a warm summer’s day by the water or as the finishing touch to any outfit, from crisp white linen to the latest trends in streetwear.