Be sure to Take note that setting up in 2005, Rolex started engraving the serial amount around the interior bezel (often called the rehaut) under the crystal for the 6 o’clock posture. 100M Watertight: With a h2o resistance of as much as 100M you can easily handle most conditions in https://www.watchesworld.com/a-history-of-watch-reference-numbers/