Remember to Take note that starting off in 2005, Rolex started engraving the serial amount to the internal bezel (often called the rehaut) under the crystal with the 6 o’clock situation. Although the crystals around the 160xx generation of Datejust watches remain created from acrylic, the sloped "pie pan" style https://www.watchesworld.com/a-history-of-watch-reference-numbers/