The Rolex Explorer II, first released in 1971, is the natural heir to the original Rolex Explorer – yet with a character all of its own. A robust, highly refined tool, the Explorer II swiftly became the watch of choice of speleologists, volcanologists and polar and jungle explorers, thanks to its specially designed features.
| Movement | Winding |
| Mechanical | Bidirectional, automatic |
| Functions | Calibre |
| Centre hour, minute and seconds hands. 24-hour display. Second time zone with independent rapid-setting of the hour hand. Instantaneous date. Stop-seconds for precise time setting | 3187 Calibre, Manufactured by Rolex |
| Water-Resistance | Oyster Architecture |
| Waterproof to 100 metres / 330 feet | Monobloc middle case, screw-down case back and winding crown |