Patek Philippe introduced the first Nautilus watch in 1976 and while the collection has evolved in the years since, it retains the defining principles of those original models. More specifically, Nautilus watches are water resistant luxury sports watches, with octagonal bezels, a sense of elegance and a focus on functionality. While the numerous models in the blue dial Nautilus category vary quite significantly in terms of complications, they are brought together by their dial color. Over the years, blue dials have proved to be extremely popular with luxury watch buyers and manufacturers have responded to this demand. The color works especially well with the Nautilus, however, complimenting its porthole-like design, while ensuring the dial stands out against the case material. Speaking of which, the materials available on Patek Philippe Nautilus watches with a blue dial include stainless steel, which has a classic appeal, white gold, which provides a similar visual quality to steel but adds an extra sense of luxury, or two-tone rose gold and steel, which adds warmth and an extra level of visual intrigue.