You should Notice that beginning in 2005, Rolex started engraving the serial quantity to the interior bezel (often known as the rehaut) underneath the crystal in the 6 o’clock posture. Possibly most important with regard to horological history writ huge was the debut in the “Omega” caliber in 1894, a https://www.watchesworld.com/a-history-of-watch-reference-numbers/