Be sure to Be aware that starting up in 2005, Rolex started engraving the serial selection to the inner bezel (also called the rehaut) beneath the crystal in the 6 o’clock posture. Its huge and eye-catching spherical face includes three subdials for timing seconds, minutes, and hours—far more time-holding capabilities https://www.watchesworld.com/a-history-of-watch-reference-numbers/