This Rolex Explorer II with its 42 mm Oystersteel case, with monobloc middle case, screw down case back. The screw down winding crown, with twinlock double waterproofness system. The bezel is fixed with a 24 -hour graduation, the black dial with an arrow-shaped 24-hour hand and hour markers in highly legible luminescent Chromalight. Chromalight display is an innovation that improved visibility in dark environments the dial is protected by a scratch-resistant sapphire crystal with cyclops lens over the date. The power behind this Rolex is the Calibre 3187 automatic movement it offers functions that include centre hour, minute and seconds hands. 24 hour display, and a second time zone with independent rapid-setting of the hour hand. Instantaneous date, and stop-seconds for precise time setting. Offering a 48-hour power reserve and is water resistant at 100 meters / 330 feet. Complimented by an Oyster, flat three-piece link bracelet in Oystersteel and secured with a folding Oysterlock safety clasp.