Rolex has a storied history of building tool watches dedicated to professional users. In 1953, Edmund Hillary and Tenzing Norgay were the first to reach the summit of Mount Everest, with a Rolex Oyster Perpetual on Hillary’s wrist. In honor of the expedition, Rolex released the Explorer later that year.
Over the years, the Explorer I has been produced in various executions. Except the very earliest ones, they all have one thing in common: the characteristic 3-6-9 numerals on the dial (the so-called ‘Explorer dial’).