Please Be aware that beginning in 2005, Rolex commenced engraving the serial selection around the internal bezel (also known as the rehaut) under the crystal in the 6 o’clock posture. Bodyweight: Legitimate Rolex watches are created from large-top quality materials, usually resulting in a heavier truly feel than counterfeit watches. https://www.watchesworld.com/a-history-of-watch-reference-numbers/