Rolex Explorer II
Rolex Explorer II is a self-winding Swiss made wristwatch introduced by Rolex in 1971. The watch was originally intended to be a tool watch for speleologists. The fixed 24-hr bezel and bright red arrow hand were designed to keep track of day and night while caving.
The Explorer line originated in honor of Sir Edmund Hillary's successful ascent of Mount Everest in 1953. The Rolex Explorer is part of Rolex's Professional line.