Rolex Explorer II Black Dial 226570Overview The Explorer II was designed in 1971 for expeditions in environments where natural light cues were absent. The fixed 24 hour bezel and the independently adjustable local hour hand exist to solve that specific problem distinguishing day from night without relying on ambient conditions. The 226570 continues that logic, updated with current movement architecture and a 42mm case that gives the dial more room to read at a distance. The case is