This Invicta men's Subaqua Noma III Collection chronograph watch is sure to satisfy your every time-telling need with a sophisticated flair. The 50-millimeter case is constructed out of stainless steel, with a stainless steel bezel, and a textured stainless steel band that includes a fold-over clasp with safety mechanism for a perfectly secure fit. The dial window is made of tough, scratch-resistant sapphire and protects the beautiful mother-of-pearl dial face, which features silver-tone hour indexes, two eye-catching chronograph sub-dials and a date calendar above the six o'clock position. In addition, a tachymeter subtly circles the dial face, and raised Arabic numerals line the unidirectional bezel at five-minute intervals. Powered by Swiss-made movement, this handsome timepiece is water resistant to 1640 feet. Subaqua Collection Led with expert engineering, and always ready to face the depths, no feat or occasion will ever be too great for Invicta’s Subaqua to handle. The sheer magnitude of this mighty timepiece is superbly executed with surgical-grade solid stainless steel, Swiss automatic movements, and multiple color options of ionic plating. Managing up to 500 meters of water, finished off with a unidirectional rotating bezel, integrated shock resistance, and Invicta’s luminous Tritnite hands, the Subaqua is the diver’s definitive in negotiating any adventure by sea or by land. Screw Down Crowns: Many Invicta watches are equipped with a screw down crown to help prevent water infiltration. This is most common on our Diver models. In order to adjust the date and/or time on such a watch, you must first unscrew the crown before you can gently pull it out to its first or second click stop position. To do this, simply rotate the crown counterclockwise until it springs open. When you have finished setting the watch, the crown must then be pushed in and screwed back in tightly. Not doing so will cancel the water resistance of the watch and will void all warranties from the manufacturer. Overall, this process should not require a lot of effort or force.