Description: Rolex Explorer II ref 216570 Pre-owned Rolex Explorer II ref 216570 (2017) marked a major update for the collection and a return to some of its most recognizable design cues. Originally developed for spelunkers and cave explorers, the Explorer II was made to distinguish between day and night hours in environments where natural light disappears. This generation demonstrates that purpose. Rolex increased the case size to 42mm for better legibility and brought