Adventurers Tool The Rolex Explorer II was introduced in 1971 as a companion for cave explorers and adventurers operating in low-light environments. With its fixed 24-hour bezel and dedicated GMT hand, it offers clarity and reliability in the most challenging conditions. Polar Precision This reference 16570, from 1995, features a 40mm Oystersteel case with a fixed 24-hour bezel and white dial. Powered by the calibre 3185 automatic movement, it delivers a 48-hour power reserve and is secured with an Oyster bracelet and Oysterclasp. A rugged and dependable timepiece for those who venture beyond the ordinary.