The Rolex Datejust was released in 1945 for Rolex’s 40th birthday. It was the first wristwatch in the world to have a self-adjusting date function. It was a revolutionary chronometer, changing the face of timepieces forever, and confirming Rolex’s position as one of the most innovative watchmakers around. Notable figures to have worn this classic Rolex watch include US President Eisenhower, Jennifer Aniston and Rihanna. If you're looking for a pre-owned watch, a Rolex Datejust is a good place to start.