[PDF] OYSTER PERPETUAL GMT-MASTER II - contentx ROLEX SERVICE THE HEART OF THE GMT-MASTER II MODEL Screwed-down position (position 0) The crown is completely screwed down against the case. When the crown is in this position, the Oyster Perpetual GMT-Master II is guaranteed waterproof to a depth of 100 metres (330 feet). Manual winding (position 1) The crown is unscrewed. To wind How to Operate a Rolex GMT Master II | Our Everyday Life Jan 10, 2019The GMT Master watch was originally designed for pilots because the watch simultaneously displays the time in three different time zones. The GMT Master II is an automatic watch, which means it winds automatically when worn or placed in a watch winder. It features a Twinlock seal on the crown that makes it waterproof up to depths of 330 feet.