Please note that commencing in 2005, Rolex began engraving the serial range about the internal bezel (often called the rehaut) beneath the crystal at the 6 o’clock situation. ” For example, should you opened a Rolex catalog while in the mid-’60s, you may’ve uncovered the following references shown upcoming to https://www.watchesworld.com/a-history-of-watch-reference-numbers/