Remember to Take note that starting in 2005, Rolex began engraving the serial quantity over the internal bezel (also known as the rehaut) beneath the crystal in the six o’clock position. Excess weight: Genuine Rolex watches are made from high-high-quality materials, frequently resulting in a heavier sense than counterfeit watches. https://www.watchesworld.com/a-history-of-watch-reference-numbers/