Make sure you Be aware that commencing in 2005, Rolex began engraving the serial amount within the interior bezel (also called the rehaut) beneath the crystal with the 6 o’clock situation. While the crystals around the 160xx generation of Datejust watches are still produced from acrylic, the sloped "pie pan" https://www.watchesworld.com/a-history-of-watch-reference-numbers/