The “Datejust” identify had become a long lasting fixture on its dial, and also other features including the palms, bezel, hour markers, and crystal (with cyclops magnification lens) took forms that are still very much present on the trendy Datejust watches that Rolex manufactures today. ST a hundred and five.003-65 https://www.watchesworld.com/a-history-of-watch-reference-numbers/