utilizing the steadfast guidance of the Invicta Pro Scuba Diver. Stylishly traditional, internal workings are created with variations of either Swiss chronograph or 21-jewel automatic movements and voluntarily navigate in depths as much as 300 meters. Constructed with positive prowess, the perseverance with which these wrist watches work makes the Pro Diver the quintessential in efficiency. Screw Down Crowns: Many Invicta watches are equipped with a screwdown crown to assist avoid water seepage. This is most common on our Diver models. In order to change the date and/or time on such a watch, you should first loosen the crown before you can carefully pull it out to its very first or second click stop position. To do this, merely turn the crown counterclockwise till it springs open. When you have ended up setting the watch, the crown must then be pushed in and screwed back in tightly. Refraining from doing so will cancel the water resistance of the watch and will void all warranties from the producer. In general, this procedure must not need a lot of effort or force.