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Screw down Crown

Commonly found on dive watches, a screw-down crown aids water-resistance by sealing the crown to the case of the watch. A seal is achieved when the case locks with the crown's internal threads and gaskets fastening the crown into its place. In order to adjust the date and/or time on a watch with a screw-down crown, 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 gently in and screwed back in tightly. Not doing so will cancel the water-resistance of the watch. Overall, this process should not require a lot of effort or force.