The “Datejust” name had become a long term fixture on its dial, and also other features including the hands, bezel, hour markers, and crystal (with cyclops magnification lens) took forms that remain very much existing on the fashionable Datejust watches that Rolex manufactures currently. Gentlemen's watches: The Pagani Style and https://www.watchesworld.com/a-history-of-watch-reference-numbers/