Datejust has been a bread & butter of Rolex, it started with aN invention of Date change at 12 midnight and later a magnifier lens , they made Rolex famous. The turnograph was created by Rolex for the USA Thunderbird Pilots in 1952, it was essentially a Datejust with a bi-directional bezel. The turning bezel was later used in the famous Rolex Submariner (in 1953) and subsequently GMT Master PamAm (in 1954).
The Turnograph was also copied by many, including one of the best watchmakers Vacheron Constantin. This make the Rolex Turnograph really a classic.