Launched in 1976, the Patek Philippe Nautilus is an elegant, luxurious sports watch, which offers water resistance, and design features inspired by the portholes on a boat. As the iconic collection has grown, new complications have been added and one of the most intriguing is the moonphase indicator, displaying the different lunar stages. Patek Philippe's moonphase indicators make use of a 'bosom' style display. When the waning moon disappears from view on one side of the display, the waxing moon begins to appear on the other side. This complication is popular within the luxury watch market, because it requires careful engineering and helps to enhance the appearance of the dial. Moonphase Nautilus models may also include other complications, such as date or annual calendar display. Watches within this category are available with black, blue or grey dial colors, while there is also a choice of stainless steel, rose gold or white gold for the case material, depending on your personal preference and available budget.