The successor to the original Oyster, the Rolex Explorer is often referred to as the luxury watch of the extremes. The Explorer I sports a 36mm case with numerous bands and dial combinations, while the Explorer II boasts a 40mm case size. Optional DLC Oysterlock bracelet makes this timepiece a very popular option for adventure enthusiasts.Since 1971, the Explorer II has accompanied expeditions around the world. It features a 24-hour hand, which is invaluable to speleologists and polar explorers as it allows them to distinguish day from night. The latest Explorer II features a 42 mm case and is the ideal instrument to help today's expeditions push the boundaries even further.