You should Observe that starting up in 2005, Rolex commenced engraving the serial amount on the interior bezel (generally known as the rehaut) under the crystal with the 6 o’clock place. Potentially most vital with respect to horological history writ massive was the debut of your “Omega” caliber in 1894, https://www.watchesworld.com/a-history-of-watch-reference-numbers/