Lange 31 by A. Lange & Sohne Per its name, the Lange 31, to debut at SIHH, is the first watch that has a 31-day power reserve. Stacked mainspring barrels last 10 times longer than most movements. The wristwatch is manually wound and has 406 parts. Jaeger Le Coultre Master Eight Days Perpetual This skeletonized timepiece measures hours, minutes, date, month and year; tracks moon phases; and differentiates between day and night. It is mechanically wound with an eight-day power reserve and boasts 250 parts. What's more, there will only be 100 of these watches made. It will debut at SIHH. Patek Phillipe Phillipe Nautilus The watchmaker launched the Nautilus collection last fall but will introduce a new version of the Nautilus at Baselworld. It will boast a stainless steel body with a sapphire-crystal caseback and a self-winding mechanical movement. Piaget Polo Chronograph The first self-winding movement in Piaget's 133-year history, this 18-carat pink gold watch boasts a 52-hour power reserve. It will debut at SIHH. Victorinox Swiss Army Dive Master 500 Limited Edition This new version of the spring 2006 Dive Master 500, to debut at Baselworld, is encased in a lightweight titanium case, withstands dives up to 500 meters (1,650 feet) and has a self-winding calibre with a power reserve exceeding 42 hours. Its back is see-through, exhibiting the watch's skeleton while maintaining a waterproof seal.